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.