Shut-off valves and stopcocks for water filters
John Guest shut-off valves offer a reliable solution for safely and precisely controlling water circuits or pipe connections. Whether it’s about fully opening or closing the flow – these valves are ideal for managing water systems flexibly. In addition, they are perfectly suited for use as valves on storage tanks or as faucets, making them an essential contribution to the efficiency and safety of water systems in a wide range of applications.
All John Guest fittings used for VISION AQUA water filters are specifically designed and certified for use in the food and drinking water industry as well as water treatment. The high-quality materials and precise manufacturing of the components ensure the highest level of safety and durability, especially in hygienically sensitive areas. This makes them safe to use in drinking water systems or other applications where cleanliness and safety are paramount.
Benefits of Shut-Off Valves in Water Treatment
Shut-off valves play a crucial role in the efficiency and control of water systems. They not only allow for easy regulation of water flow but also help extend the life of filters and other system components. With quick and uncomplicated shut-off functionality, maintenance work or filter changes can be carried out safely and cleanly without interrupting the entire water circuit. In modern water treatment systems, they are therefore indispensable elements that support smooth operation and the sustainable use of resources.
The ASV7 angle valve adapter from John Guest is the ideal choice when you need to connect a 3/8" plastic tube to your water filter or reverse osmosis system. It is mounted directly onto the cold water angle valve under the sink, creating a stable and secure connection.Equipped with an integrated check valve, the adapter protects your water installation against backflow. The built-in shut-off valve allows for easy water supply interruption, making filter changes and maintenance particularly convenient. A practical and reliable spare part for various kitchen and water treatment applications.Thanks to robust brass connections and premium plastic components, the ASV7 guarantees long-lasting performance and a reliable seal. John Guest stands for quality you can trust in every installation.Benefits at a glance:Compatible with 3/8" plastic tubingCheck valve for backflow protectionShut-off valve for convenient maintenanceStrong brass and plastic constructionSuitable for filter systems and water installationsThe product range is not suitable for compressed air, explosive gases, petroleum, or other liquids or in heating systems or similar applications.
The ASV9 angle valve adapter from John Guest is the perfect solution for connecting water filters, reverse osmosis systems and other appliances directly to your cold water supply. With its precise 3/8" thread and 1/4" tube connection, it offers the standard size for most water filter systems, ensuring maximum compatibility.The built-in check valve reliably prevents backflow into the water line, while the integrated shut-off valve makes it easy to stop the water flow whenever maintenance or filter replacement is required. This ensures safety and convenience for your water filter or reverse osmosis system.Made from durable brass and high-quality plastic, the ASV9 provides a secure and long-lasting connection. With this John Guest spare part, you get proven quality and reliable performance for your water installation.Benefits at a glance:Standard 1/4" size for reverse osmosis systems and water filtersIntegrated check valve for safe operationConvenient shut-off valve for easy maintenanceHigh-quality materials for long-lasting useSuitable for coffee machines, water dispensers and water treatmentThe product range is not suitable for compressed air, explosive gases, petroleum, or other liquids or in heating systems or similar applications.
Experience maximum flexibility and reliability when installing your water filter system. This faucet connection adapter with aerator and wastewater return connects your faucet to a 1/4″ tube system. It is an excellent spare part or upgrade for water filters, reverse osmosis systems and replacement components. The connection uses an M22 female thread (IG) ensuring a smooth link between your faucet and your filtration unit.With a well-thought-out design you benefit from convenient handling: The built-in aerator (perlator) provides a steady, splash-free water flow — perfect for use with a 1/4″ hose equipped RO system or direct water filter. The integrated return line for wastewater ensures excess water is neatly redirected, increasing the efficiency of your RO unit and simplifying discharge.The adapter perfectly complements your filtration setup and is finished in a chrome-look design with durable build. Whether at home, in a camper van or on the move — connecting your water filter or RO system becomes effortless. This adapter is compatible with the following VISION AQUA water filters:VA-Basic – travel water filter kit, reverse osmosis water filterVA-Basic PLUS – mobile water filterVanLife – water filter for campers and motorhomesBenefits for you at a glance:Direct M22 female thread to 1/4″ tube – perfect for water filters & RO systemsBuilt-in aerator ensures comfortable, splash-free flowWastewater return line included – clean dischargePremium workmanship – durable and functionalCompatible with VA-Basic, VA-Basic PLUS and VanLife by VISION AQUA
The high-quality John Guest 3/8" OD Angle Shut-Off Valve provides a reliable and convenient solution for safe water connections in kitchens and households. Perfect for water filters, reverse osmosis systems, coffee machines, and drinking water dispensers, it allows precise control of water flow and enables individual appliances to be shut off without interrupting the main water supply.Thanks to the John Guest push-fit connection, installation is quick, secure, and tool-free. The built-in non-return valve prevents backflow into the water network in compliance with DIN 1988 / EN 1717. Its durable construction ensures a long service life, making it suitable for both domestic and commercial use.Ideal for maintenance work, filter changes, or appliance replacement – one simple movement shuts off the water flow safely. This angle valve combines safety, reliability, and ease of use – an essential spare part for every professional water filtration setup.Key benefits:Fits 3/8" OD tubingPerfect for water filters, reverse osmosis systems, and coffee machinesIndependent shut-off without interrupting main water flowBuilt-in check valve prevents backflowEasy tool-free installation with John Guest push-fit technologyDurable and high-quality constructionCompliant with DIN 1988 / EN 1717
The John Guest Shut-Off Valve PPSV501222W offers outstanding build quality and effortless handling. It is the perfect choice for use in water filtration systems, reverse osmosis units, and other potable water applications. With its convenient 3/8" tube OD to 1/4" female NPTF connection, installation takes only seconds – no tools required.Made from high-grade, food-safe plastic, this valve ensures a secure seal even with frequent use. The ergonomic blue lever handle allows precise flow control, making maintenance and service of downstream components quick and safe.Important Note: The John Guest shut-off valves are designed exclusively for water applications. They must not be used with compressed air, explosive gases, petroleum, or other liquids, nor in heating systems or similar environments. Use only in the fully open or fully closed position.Key Benefits:Premium quality by John GuestQuick, tool-free installationPerfect for RO systems and water filtersDurable and food-grade materialsReliable isolation of downstream componentsEasy operation with ergonomic handleSafe use in water systems onlyThe shut-off valves must not be used as follows:as flow control (only partially open)as a permanent pipe end (here we recommend using our end caps.)only connected on one sideas a tap or faucet
The John Guest Shut-Off Valve PPSV040808W – 1/4" Tube OD delivers a reliable and durable solution for controlling water flow in water filters, reverse osmosis systems, and other drinking water applications. Its precision push-fit connection ensures a secure, leak-free installation every time – no tools required.The compact design and smooth-turn lever make it easy to quickly isolate or reconnect the water supply, perfect for maintenance tasks such as filter changes or cleaning procedures.The JG shut-off valves are designed specifically for temporary maintenance of downstream components or assemblies. They must only be operated in the positions “fully open” or “fully closed.” This valve is suitable for potable water only. Not for use with compressed air, explosive gases, petroleum, heating systems, or similar applications.Customer Benefits:Quick and easy push-fit installationLeak-proof design without the need for toolsPerfect for reverse osmosis systems and water filtersDurable John Guest quality constructionSimple maintenance and operationDesigned for temporary maintenance useThe shut-off valves must not be used as follows:as flow control (only partially open)as a permanent pipe end (here we recommend using our end caps.)only connected on one sideas a tap or faucet
The John Guest shut-off valve PPSV041212W with a 3/8" tube connection offers outstanding quality and easy operation. Perfect for water filters, reverse osmosis systems and drinking water installations, this valve ensures reliable control of water flow. The ergonomic lever allows smooth handling and provides a secure seal when closed.Made from durable, food-grade plastic, this valve guarantees a long service life even with frequent use. The push-fit connections enable quick, tool-free installation, making it ideal for maintenance, replacement, or system upgrades. Professionals and DIY enthusiasts alike appreciate its dependability and ease of use.Important note: These shut-off valves are not suitable for compressed air, explosive gases, petroleum or other liquids, and must not be used in heating systems or similar applications.John Guest shut-off valves are designed for temporary maintenance of downstream components or assemblies. They must be used only in the positions “fully open” or “fully closed.”Key Benefits:Suitable for 3/8" tube connectionsPerfect for water filters, reverse osmosis and drinking water systemsQuick, tool-free installation with push-fit technologyStrong, food-grade plastic constructionDurable and reliable performanceDesigned only for fully open or fully closed operationThe shut-off valves must not be used as follows:as flow control (only partially open)as a permanent pipe end (here we recommend using our end caps.)only connected on one sideas a tap or faucet
The John Guest shut-off valve delivers reliability and precision for controlling water flow in filtration systems, reverse osmosis units, and other water treatment setups. Its push-fit connection system ensures fast, secure installation without tools, saving time and effort during setup or maintenance.Built from durable, high-quality plastic with a smooth-turning blue lever handle, this valve provides long-lasting performance and leak-free operation. Ideal for use in drinking water applications, water filters, and coolers where dependable shut-off functionality is essential.Important note: These shut-off valves are not suitable for compressed air, explosive gases, petroleum, or any other liquids, nor for use in heating systems or similar applications.John Guest valves are designed to allow temporary maintenance of downstream components or assemblies and must only be used in fully open or fully closed positions.Key Benefits:Quick and secure push-fit connectionIdeal for reverse osmosis systems and water filtersDurable, corrosion-resistant body for long lifeSmooth, reliable operation with easy lever controlDesigned for easy maintenance and consistent performanceThe shut-off valves must not be used as follows:as flow control (only partially open)as a permanent pipe end (here we recommend using our end caps.)only connected on one sideas a tap or faucet
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