Interlocking tab design resists crushing|Extended length permits an even sealing surface for the fitting's gasket|Tapered and fluted ends minimize insertion resistance and movement|Designed for used in potable water installations|Designed for insertion into the inside diameter of CTS polyethylene plastic tubing|Recommended on all pack-joint and ring compression water service fitting installations onto polyethylene tubing or pipe|Prevents the collapse of the tubing or pipe end