Flair-It fittings are constructed of durable Polyoxymethylene (POM) and are compatible with PEX and PB. The patented design consists of a nut and flared insert and requires no tools. The fittings push against the ID and OD of the pipe, creating a strong long-term seal. Flair-It fittings are available in 3/8 to 3/4 in and are stocked in bulk and barcoded versions. Must be ordered in lots of ten. Starter kits are also available. Valves are directional.