Flair-It fittings are ideal for professional installation of hot and cold potable water systems or do it yourself plumbing repairs. Flair-It Compression PEX fittings are compatible and work great with any brand or type of SDR-9 PEX or PE-RT tubing as well as Polybutylene pipe. Flair-It Compression PEX fittings are constructed of durable Polyoxymethylene material. Polyoxymethylene material is a resilient plastic resin that is resistant to stress fractures and extreme temperatures. Flair-It PEX and polybutylene fittings do not require any special tools. Installation is easy cut the tubing square, slide the nut along the tubing, rock the fitting all the way into the tubing, slide the nut back onto the fitting and tighten it as far as it will go. Flair-It fittings have been the standard do-it-yourself polybutylene repair solution for twenty years.