Reliability and precision of John Guest Fittings, the industry standard for push-fit and quick-connect fittings used in a wide range of water treatment systems. Known for their high-quality design and easy installation, John Guest fittings are ideal for Water filtration, RO, under-sink beverage, as well as Brewing dispensing systems.

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Frequently asked questions

An equal straight connector joins two pipes of the same size (e.g. 1/4"x1/4"); a reducing connector joins two different sizes (e.g. 3/8"x1/4"), letting you step tube size up or down in a run.

They're designed for tool-free installation — simply push the tube fully into the fitting and it locks and seals automatically; no compression, gluing or special tools required.

Common drinking water and filtration tube sizes including 1/4", 3/8" and 5/16" (8mm) — check the specific fitting for the exact sizes it connects.

Yes — most push-fit fittings can be released by pushing in the collet while pulling the tube, allowing the fitting to be reused, provided the tube end is clean and undamaged.

Yes, John Guest fittings are a standard choice for drinking water and filtration tubing throughout the industry, widely used in under-sink filter and RO installations.