Flair-It 3/8 PEXx1/2 In. FPT Swivel Coupling. Made of durable PVC, this coupling is designed to connect to a faucet or any 1/2" MPT. It features a BSP thread, making it compatible with faucets that have parallel threads, often found in manufactured homes and RVs. Quick and easy to install, this coupling requires no tools and can be used on PEX or PB pipe. Field tested for over 30 years, it is suitable for both hot and cold water.