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Adapters and reducers for water filters

John Guest® adapters and reducers are the ideal solution when you need a secure and reliable pipe connection between different sizes or connection types. Whether you are switching from metric to imperial sizes or between internal and external threads, as well as John Guest® Speedfit push-fit connectors, the wide range of adapters offers the necessary flexibility. These high-quality fittings ensure quick, easy, and permanent installation without requiring complex tools.

John Guest® adapters are particularly well-suited for VISION AQUA® water filtration systems. All pipe connections used are certified and approved for use in the food and drinking water industries, as well as in water treatment applications. They meet high hygiene standards and provide a reliable solution that meets the stringent requirements in these sectors. By using John Guest® adapters, you ensure a long-lasting and efficient connection that does not compromise on quality or safety.

Versatile Applications and Easy Handling

Thanks to their versatile applications, John Guest® adapters and reducers are not only essential in water filtration technology but also in other sectors such as industry and craftsmanship. Their ease of use and innovative push-fit technology make them ideal for installations where speed and precision are crucial. The system is designed to be installed and dismantled without tools, saving time and minimizing the risk of leaks.

John Guest Eckventil-Adapter 3/8" auf 3/8" inkl. Absperrhahn und Rückschlagventil
Angle valve connection adapter for 3/8" thread to 3/8" tube OD with check valve and shut-off valve - John Guest
The angle valve connection adapters are specially designed for connection to angle valves. They enable the water connection of water filters, osmosis systems, coffee machines, soda water devices, water treatment systems etc. The appliance connection can be shut off separately - without interrupting the water flow for kitchen use. Maintenance work, filter change and appliance replacement can thus be carried out easily. An additionally integrated check valve prevents backflow into the water network according to DIN 1988.Properties:For drinking water applications and water treatment systemsFast, frequent loosening of the connection possibleVery good flow propertiesIntegrated check valveIntegrated shut-off valveThe product range is not suitable for compressed air, explosive gases, petroleum, or other liquids or in heating systems or similar applications.

€35.70*
John Guest Eckventil-Adapter 3/8" auf 1/4" inkl. Absperrhahn und Rückschlagventil
Angle valve Connection adapter - 3/8" thread to 1/4" tube OD with check valve and shut-off valve - John Guest
The angle valve connection adapters are specially designed for connection to angle valves. They enable the water connection of water filters, osmosis systems, coffee machines, soda water devices, water treatment systems etc. The appliance connection can be shut off separately - without interrupting the water flow for kitchen use. Maintenance work, filter change and appliance replacement can thus be carried out easily. An additionally integrated check valve prevents backflow into the water network according to DIN 1988.Properties:For drinking water applications and water treatment systemsFast, frequent loosening of the connection possibleVery good flow propertiesIntegrated check valveIntegrated shut-off valveThe product range is not suitable for compressed air, explosive gases, petroleum, or other liquids or in heating systems or similar applications.

€35.70*
Der Hahnanschluss Adapter mit Perlator und Rücklauf für Abwasser frontal
Tap connector adapter with aerator and return for wastewater - M22 inner thread to 1/4
The tap connection adapter with aerator and return for wastewater is used to retrofit a VISION AQUA® water filter to an existing water tap. Connections: Inlet: M22 inner thread Supply outlet: 1/4" tube crimp connection Return wastewater: 1/4" tube crimp connection Can be used with the following VISION AQUA® water filters:VA-Basic - travel water filter set, reverse osmosis water filterVA-Basic PLUS - Mobile water filterVanLife - water filters for campers and mobile homes

€16.00*
Anschlussadapter mit 3/4" Gewinde für den Hydro-Stopper auf 1/4" Rohr
Connection adapter - 3/4“ inner thread BSPP to 1/4“ tube OD - John Guest
The PM series for metric tube dimensions is made from black acetal copolymer (POM) plastic and is equipped with food-safe nitrile O-rings.The product range can be used in particular for liquid media, air and inert gases and is therefore also suitable for N2 and CO2. The PM series products are also suitable for pneumatic and vacuum applications in a wide variety of industrial sectors.Properties:simple and quick installation "right first time"ideal for compressed air and liquidsmountable without toolsfast, multiple disconnection possiblevery good flow propertiesThe connectors are also ideal for air, non-flammable gases (e.g. N2 and CO2) and vacuum applications.

€12.86*
Anschlussadapter mit 3/4" Gewinde für den Hydro-Stopper der VISION AQUA Wasserfilter
Connection adapter - 3/4“ inner thread BSPP to 3/8“ tube OD - John Guest
The PM series for metric tube dimensions is made from black acetal copolymer (POM) plastic and is equipped with food-safe nitrile O-rings.The product range can be used in particular for liquid media, air and inert gases and is therefore also suitable for N2 and CO2. The PM series products are also suitable for pneumatic and vacuum applications in a wide variety of industrial sectors.Properties:     simple and quick installation "right first time"     ideal for compressed air and liquids     mountable without tools     fast, multiple disconnection possible     very good flow properties

€11.42*
Einschraub-Verbinder für Wasch- oder Spülmaschine
Screw-in connector - 15mm tube OD to 3/4" outer thread - John Guest
The PM series for metric tube dimensions is made from black acetal copolymer (POM) plastic and is equipped with food-safe nitrile O-rings.The product range can be used in particular for liquid media, air and inert gases and is therefore also suitable for N2 and CO2. The PM series products are also suitable for pneumatic and vacuum applications in a wide variety of industrial sectors.Properties:     simple and quick installation "right first time"     ideal for compressed air and liquids     mountable without tools     fast, multiple disconnection possible     very good flow propertiesThe connectors are also ideal for air, non-flammable gases (e.g. N2 and CO2) and vacuum applications.

€8.21*
Wasserhahn Adapter M24 zu M22 - Langversion - stehend
M24 AG to M22 AG long version - water filter faucet adapter
Properties: Material: brass Weight: 16g Overall Size: 21,5 x 23.5mm / 0.85"" x 0.93"" (H*D) Finish: Electroplated finish External thread diameter: M24 to M22 incl. food-safe EPDM seal 

€7.99*
Schott connector - 3/8“ hose AD
Bulkhead - 3/8“ tube OD - John Guest
The PP series for imperial tube dimensions is made from white polypropylen (PP) plastic and is equipped with food-safe EPDM O-rings.The product range was developed for drinking water applications, water treatment systems etc.Properties:     for drinking water applications and water treatment systems     Polypropylene (PP)     mountable without tools     fast, repeated disconnection possible     very good flow propertiesThe product range is not suitable for compressed air, explosive gases, petroleum or other liquids as well as in heating systems or similar areas of application.

€6.97*
Schott-Verbinder in schwarz
Reducing Bulkhead - 12mm tube OD to 3/8" tube OD - John Guest
The PI product range for imperial pipe dimensions from 5/32“ to 1/2“ is made of gray acetal copolymer (POM) and is equipped with food-safe nitrile O-rings.This makes the connectors ideal for use in the areas of food, drinking water and water treatment.Propertiesfor drinking water applications and water treatment systemsacetal copolymer (POM)mountable without toolsquick, multiple release of the connection possiblevery good flow propertiesThe connectors are also ideal for air, non-flammable gases (e.g. N2 and CO2) and vacuum applications.

€6.82*
Aufschraub-Verbinder 3/8" Rückseite für VISION AQUA Wasserfilter
Screw-on connector - 3/8“ tube OD to 3/8“ inner thread - John Guest
The PI Series for imperial tubing is manufactured from gray acetal copolymer (POM) and features food grade nitrile O-rings.It was developed for food, drinking water applications, water treatment systems, etc.Propertiesfor drinking water applications and water treatment systemsacetal copolymer (POM)mountable without toolsquick, multiple release of the connection possiblevery good flow propertiesThe connectors are also ideal for air, non-flammable gases (e.g. N2 and CO2) and vacuum applications.

€6.74*
Einsteck-Reduzierverbinder mit 15 mm Stutzen in schwarz
Plug-in reducing connector - 15mm nozzle to 12mm tube OD - John Guest
The PM series for metric tube dimensions is made from black acetal copolymer (POM) plastic and is equipped with food-safe nitrile O-rings.The product range can be used in particular for liquid media, air and inert gases and is therefore also suitable for N2 and CO2. The PM series products are also suitable for pneumatic and vacuum applications in a wide variety of industrial sectors.Properties:     simple and quick installation "right first time"     ideal for compressed air and liquids     mountable without tools     fast, multiple disconnection possible     very good flow propertiesThe connectors are also ideal for air, non-flammable gases (e.g. N2 and CO2) and vacuum applications.

€6.40*
Wasserhahn Adapter M24 zu M22
M24 AG to M22 AG - water filter faucet adapter
Properties: Material: brass Weight: 12g Overall Size: 12.5 x 23.5mm / 0.49"" x 0.93"" (H*D) Finish: Electroplated finish External thread diameter: M24 to M22 incl. food-safe EPDM seal 

€5.99*
Einsteck-Reduzierverbinder mit 12 mm Stutzen auf 10 mm Rohr in schwarz
Plug-in reducing connector - 12mm nozzle to 10mm tube OD - John Guest
The PM series for metric tube dimensions is made from black acetal copolymer (POM) plastic and is equipped with food-safe nitrile O-rings.The product range can be used in particular for liquid media, air and inert gases and is therefore also suitable for N2 and CO2. The PM series products are also suitable for pneumatic and vacuum applications in a wide variety of industrial sectors.Properties:     simple and quick installation "right first time"     ideal for compressed air and liquids     mountable without tools     fast, multiple disconnection possible     very good flow propertiesThe connectors are also ideal for air, non-flammable gases (e.g. N2 and CO2) and vacuum applications.

€5.99*
Einsteck-Winkel-Verbinder - 3/8“ Stuzen AD auf 1/4“ Rohr AD
Plug-in elbow connector - 3/8“ nozzle to 1/4“ tube OD - John Guest
The PP series for imperial tube dimensions is made from white polypropylen (PP) plastic and is equipped with food-safe EPDM O-rings.The product range was developed for drinking water applications, water treatment systems etc.Properties:     for drinking water applications and water treatment systems     Polypropylene (PP)     mountable without tools     fast, repeated disconnection possible     very good flow propertiesThe product range is not suitable for compressed air, explosive gases, petroleum or other liquids as well as in heating systems or similar areas of application.

€5.71*
Plug-in elbow connector - stem elbow - 3/8“ nozzle to 3/8“ hose AD
Plug-in elbow connector - 3/8“ nozzle to 3/8“ tube OD - John Guest
The CI range is manufactured from white acetal copolymer (POM) and fitted with food grade EPDM O-rings. They are used specifically in water treatment, drinking water and beverage applications. They are also suitable for other liquids and are recommended in the given technical specification for alternating cold and hot water applications.Properties:simple and quick installation "right first time"ideal for compressed air and liquidsmountable without toolsfast, multiple disconnection possiblevery good flow propertiesThe product series is not suitable for use in compressed air and vacuum areas.

€5.56*
Einschraub-Verbinder 3/8" Rohr auf 1/2" Außengewinde für vie VISION AQUA Wasserfilter
Screw-in connector - 3/8“ tube OD to 1/2“ OT NPTF USA - John Guest
The PP series for imperial tube dimensions is made from white polypropylen (PP) plastic and is equipped with food-safe EPDM O-rings.The product range was developed for drinking water applications, water treatment systems etc.Properties:     for drinking water applications and water treatment systems     Polypropylene (PP)     mountable without tools     fast, repeated disconnection possible     very good flow propertiesThe product range is not suitable for compressed air, explosive gases, petroleum or other liquids as well as in heating systems or similar areas of application.

€5.53*
Schott connector - 1/4“ hose AD
Bulkhead - 1/4“ tube OD - John Guest
The PP series for imperial tube dimensions is made from white polypropylen (PP) plastic and is equipped with food-safe EPDM O-rings.The product range was developed for drinking water applications, water treatment systems etc.Properties:     for drinking water applications and water treatment systems     Polypropylene (PP)     mountable without tools     fast, repeated disconnection possible     very good flow propertiesThe product range is not suitable for compressed air, explosive gases, petroleum or other liquids as well as in heating systems or similar areas of application.

€5.18*
Screw-on connector - 1/4“ hose AD to 1/4“ thread NPTF USA
Screw-on connector - 1/4“ tube OD to 1/4“ inner thread NPTF USA - John Guest
The PP series for imperial tube dimensions is made from white polypropylen (PP) plastic and is equipped with food-safe EPDM O-rings.The product range was developed for drinking water applications, water treatment systems etc.Properties:     for drinking water applications and water treatment systems     Polypropylene (PP)     mountable without tools     fast, repeated disconnection possible     very good flow propertiesThe product range is not suitable for compressed air, explosive gases, petroleum or other liquids as well as in heating systems or similar areas of application.

€5.06*
Zapfhahnanschluss - 3/8“ Rohr AD auf 7/16“ von John Guest für die VISION AQUA Wasserfilter
Tap connector - 3/8“ tube OD to 7/16“-24 inner thread UNS - John Guest
The PP series for imperial tube dimensions is made from white polypropylen (PP) plastic and is equipped with food-safe EPDM O-rings.The product range was developed for drinking water applications, water treatment systems etc.Properties:     for drinking water applications and water treatment systems     Polypropylene (PP)     mountable without tools     fast, repeated disconnection possible     very good flow propertiesThe product range is not suitable for compressed air, explosive gases, petroleum or other liquids as well as in heating systems or similar areas of application.

€4.47*
Zapfhahnanschluss von John Guest für die VISION AQUAWasserfilter von 3/4" auf 1/4"
Tap connection - 1/4" tube OD to 3/4" inner thread - John Guest
The CI range is manufactured from white acetal copolymer (POM) and fitted with food grade EPDM O-rings. They are used specifically in water treatment, drinking water and beverage applications. They are also suitable for other liquids and are recommended in the given technical specification for alternating cold and hot water applications.Properties:simple and quick installation "right first time"ideal for compressed air and liquidsmountable without toolsfast, multiple disconnection possiblevery good flow propertiesThe product series is not suitable for use in compressed air and vacuum areas.

€4.27*
Einschraub-Verbinder 3/8" Rohr auf 3/8" Gewinde von John Guest in weiß
Screw-in connector - 3/8“ tube OD to 3/8“ outer thread NPTF USA - John Guest
The PP series for imperial tube dimensions is made from white polypropylen (PP) plastic and is equipped with food-safe EPDM O-rings.The product range was developed for drinking water applications, water treatment systems etc.Properties:     for drinking water applications and water treatment systems     Polypropylene (PP)     mountable without tools     fast, repeated disconnection possible     very good flow propertiesThe product range is not suitable for compressed air, explosive gases, petroleum or other liquids as well as in heating systems or similar areas of application.

€4.03*
Zapfhahn-Anschluss von John Guest in 1/4" auf 7/16" UNS Gewinde
Tap connector - 1/4“ tube OD to 7/16“-24 inner thread UNS - John Guest
The PP series for imperial tube dimensions is made from white polypropylen (PP) plastic and is equipped with food-safe EPDM O-rings.The product range was developed for drinking water applications, water treatment systems etc.Properties:     for drinking water applications and water treatment systems     Polypropylene (PP)     mountable without tools     fast, repeated disconnection possible     very good flow propertiesThe product range is not suitable for compressed air, explosive gases, petroleum or other liquids as well as in heating systems or similar areas of application.

€3.78*
Einsteck-Reduzierberbinder in weiß 15 mm auf 12 mm
Plug-in reducing connector - 15mm nozzle to 12mm tube OD - John Guest
The PP series for imperial tube dimensions is made from white polypropylen (PP) plastic and is equipped with food-safe EPDM O-rings.The product range was developed for drinking water applications, water treatment systems etc.Properties:     for drinking water applications and water treatment systems     Polypropylene (PP)     mountable without tools     fast, repeated disconnection possible     very good flow propertiesThe product range is not suitable for compressed air, explosive gases, petroleum or other liquids as well as in heating systems or similar areas of application.

€3.72*
Einsteck-Reduzierverbinder 15 mm in braun
Plug-in reducing connector - 15mm nozzle to 3/8" tube OD - John Guest
The PI Series for imperial tubing is manufactured from gray acetal copolymer (POM) and features food grade nitrile O-rings.It was developed for food, drinking water applications, water treatment systems, etc.Propertiesfor drinking water applications and water treatment systemsacetal copolymer (POM)mountable without toolsquick, multiple release of the connection possiblevery good flow propertiesThe connectors are also ideal for air, non-flammable gases (e.g. N2 and CO2) and vacuum applications.

€3.69*
Plug-in elbow connector - stem elbow - 1/4“ nozzle to 1/4“ hose AD
Plug-in elbow connector - 1/4“ nozzle to 1/4“ tube OD - John Guest
The CI range is manufactured from white acetal copolymer (POM) and fitted with food grade EPDM O-rings. They are used specifically in water treatment, drinking water and beverage applications. They are also suitable for other liquids and are recommended in the given technical specification for alternating cold and hot water applications.Properties:simple and quick installation "right first time"ideal for compressed air and liquidsmountable without toolsfast, multiple disconnection possiblevery good flow propertiesThe product series is not suitable for use in compressed air and vacuum areas.

€3.21*
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