Philmac 20mm Metric Compression Fittings Philmac’s range of Australian made metric compression fittings are the solution for the perfect connection every time thanks to Philmac’s unique Slide and Tighten technology. Each fitting is pre-assembled and ready to use so there’s no need to disassemble the fittings or prepare the pipe prior 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. With Philmac’s metric compression fittings, just slide and tighten and the job’s done!