Wavin Hep2O 22mm Push-Fit includes unique features that enable quick and easy installation with a secure fit. It is the only push-fit plumbing system with joint recognition and secure demounting. Once the connection is in place, twist the pipe or fitting and feel the rumble, signalling a perfect fit. It simply clips the HepKey over the fitting to depress the collar and release the fitting. This system prevents tampering or accidental demounting and ensures your installation is totally secure.