Flair-It 1/2 PEXx3/4 MPT Male Adapter, made of durable Polyoxymethylene (POM), is 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. Valves are directional. Adapters with male threads. For hot and cold water. Suitable for potable water distribution.