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Push-to-pull, push-to-connect, push-in, push-fit, or instant fittings are a type of easily removed compression fitting or quick connect fitting that allows an air line to be attached, nominally without the use of tools. These fittings act similar to the way regular compression fittings work, but use a resilient O-ring for sealing, and a grip ring to hold the tube in place.
These fittings can be used on all sorts of pipe of many sizes for many purposes. This article only covers domestic-size plumbing in UK and US so far.
The main advantages of this technology over traditional soldered copper or glued plastic are that fittings can easily be unmounted and re-used, speed of assembly, assembly when wet and that the joints are still rotateable after connection.