Screw-on connector - 1/4“ tube OD to 1/4“ inner thread NPTF USA - John Guest

The John Guest Female Adaptor PI451213S is a premium connector designed for 3/8" tube (OD) to 3/8" BSP female thread. It offers a reliable, precise fit and an effortless installation experience – perfect for water filters, reverse osmosis systems, and other beverage or water treatment setups.Made from durable, food-grade plastic, this fitting ensures a leak-free and secure connection, even under continuous use. The John Guest push-fit technology allows quick assembly without tools, making it the ideal choice for both professional installers and DIY enthusiasts.Whether used as a replacement part or for new system installations, this adaptor combines durability, safety, and outstanding performance for all types of water filtration systems.Key Benefits:Quick and secure connection without toolsCompatible with 3/8" OD tube and 3/8" female threadPerfect for water filters, RO systems, and beverage setupsGenuine John Guest quality – long-lasting and reliableMade from food-grade, hygienic materialsMaintenance-free and reusableThe connectors are also ideal for air, non-flammable gases (e.g. N2 and CO2) and vacuum applications.

Suitable for use with water and food: Products are made of safe, non-toxic materials. Meets the requirements of FDA, WRAS, ANSI/NSF-51, 61, ACS, KTW and DVGW-W270. Our products are widely used in water treatment, the food/beverage industry and pneumatic systems. Function and Quality: Enables quick and convenient installation - saving time and cost. Our ISO9001, 14001 registered quality system ensures our customers receive the highest level of product quality. Maintenance is fast, thanks to easy disassembly. Applications:Beyond water and food applications, our products can be used with air, gases, vacuum and liquids. All connections can be assembled and disassembled multiple times. A wide range of sizes covers a wide range of applications. Material:Grey acetal copolymer

The John Guest Tap Connector PP3212U7W provides a secure and precise connection between 3/8" tubing and a 7/16"-24 UNS female thread. This thread type is compatible with standard 7/16"-24 UNF male fittings, commonly found in water filters, reverse osmosis systems, CO₂ setups, and beverage equipment. It fits perfectly with matching UNF or UNS male threads used on faucet adapters, filter heads, or quick-connect fittings.With its trusted push-fit technology, installation takes just seconds – simply push the tubing in and enjoy a tight, leak-free seal. Made from high-quality, food-grade acetal, this connector ensures hygiene, durability, and long-lasting reliability for all drinking water applications.Whether used for maintenance or new installations, this John Guest connector delivers top-tier performance and ease of use. Precision engineering ensures a strong, reusable connection and consistent water flow – ideal for anyone who values clean, safe, and efficient water systems.Key Benefits:Fits 3/8" tubing and 7/16"-24 UNS female thread (compatible with UNF male fittings)Quick and secure push-fit installation, no tools neededFood-grade, durable plastic for hygienic and leak-free operationReusable, long-lasting, and maintenance-friendlyThe 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.

The John Guest Tap Connector CI320816FS combines premium quality with effortless installation. It’s the perfect choice for connecting water filters, reverse osmosis systems, and other drinking water applications. The precisely machined fittings ensure a secure, leak-free connection between a 1/4" tube (outer diameter) and a 3/4" female thread. Quick to install and highly reliable – no special tools required.Made from durable, food-grade plastic, this connector is approved for use with drinking water and built to last. It provides excellent resistance to pressure and temperature changes, making it a dependable part of RO systems or water dispensers. Its robust design maintains hygienic water flow and minimizes any risk of leakage.Whether for home, hospitality, or laboratory setups, this tap connector is a smart replacement part that delivers both safety and quality. With the trusted John Guest push-fit system, installation takes only seconds, while the connection remains secure yet easily removable if needed.Customer Benefits at a Glance:Perfect for water filters, RO systems, and drinking water setupsDurable, food-grade materialQuick and tool-free installationReliable and leak-proof John Guest connectionExcellent as a replacement or system extensionThe product series is not suitable for use in compressed air and vacuum areas.

The John Guest adapter with 3/4“ female BSPP thread to 1/4“ tube connection is the perfect accessory to connect water filters and reverse osmosis systems safely to your cold water supply. Since 1/4" is the standard size for most drinking water filters, this adapter is the ideal choice for under-sink installations.The adapter is mounted directly on the 3/4" cold water supply at the angle valve and ensures a leak-proof connection for water filters, reverse osmosis systems, coffee machines or water dispensers. In our water filter systems, it is specifically used together with the Hydro Stopper, which is installed at the angle valve. This makes the installation quick, secure and highly reliable.With the proven John Guest quality, you benefit from a robust and durable fitting that perfectly integrates into your existing setup. Handling is simple, the connection is leak-free, and it is ideally suited for drinking water applications. An essential spare part for anyone who values safe and clean water.Customer Benefits at a Glance:Standard size 1/4” – perfect for reverse osmosis systems and water filtersDesigned for use with the Hydro Stopper at the angle valveCompatible with coffee machines, water dispensers and water treatment systemsDurable and reliable John Guest qualityQuick and easy installation without toolsThe connectors are also ideal for air, non-flammable gases (e.g. N2 and CO2) and vacuum applications.

The John Guest adapter with 3/4“ female BSPP thread to 3/8“ tube connection is the right choice when larger systems with higher flow rates need to be connected. It provides a secure and precise link between the angle valve and your water treatment equipment.The adapter is mounted directly on the 3/4“ cold water inlet under the sink and enables the connection of reverse osmosis systems, professional water filters, coffee machines or water dispensers. In our water filter systems, it is used together with the Hydro Stopper, ensuring a reliable and tight installation at the angle valve.Thanks to the precise John Guest engineering, this adapter ensures a stable and long-lasting fit. For anyone seeking a trustworthy spare part for drinking water systems, this adapter combines safety, durability and easy handling in one.Customer Benefits at a Glance:3/8” connection for systems with higher water flowUse in combination with the Hydro Stopper at the angle valveSuitable for reverse osmosis, water filters, coffee machines and water dispensersPremium John Guest quality and durabilityLong-lasting, leak-proof connection for drinking water applications