Wavin Hep2O Equal Elbow 90 Degree White 15 mm 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 Hep Key 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.