Our NPT (National Pipe Thread) Adapter Assembly is specifically manufactured from PEEK making it durable and chemically resistant. Our NPT Adapter is exceptionally useful for attaching 1/8OD fluoropolymer sparging lines to sparging gas tank regulator valves. It's thread configuration is 1/4 NPT Male to 1/4-28 Flat-Bottom Female ports. It is red and comes with Flangeless Fittings for 1/8" OD tubing.