Compression fittings create a mechanical joint when tightening the nut, compressing the ring onto the tube, the heat free system means joints can be made where it would be otherwise prohibited to use a naked flame... Compression fittings can be taken apart and, with a new ring,; be remade without adversely affecting their performance. Compression fittings are suitable for use on hot and cold water services, heating installations, fuel services and industrial engineering applications, fittings are suitable in low pressure gas pipework in domestic premises using copper tube (manufactured to EN 1057). Compression fittings can be installed on wet pipework which is ideal for repairs and maintenance where the complete draining of pipework is difficult.