Philmac's unique simply 'Slide and Tighten' technology makes their compact size fittings the solution for the perfect connection every time. Manufactured from light weight, high performance thermoplastic materials, each fitting is pre-assembled and ready to use. Simply cut the PE pipe square and slide it into the fitting until you feel the first point of resistance and then tighten the nut to the flange on the body of the fitting. Philmac 3G Metric Compression Fittings Data Sheet