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 tubing to NPT ports. It's thread configuration is 1/8 NPT Male to 1/4-28 Flat-Bottom Female ports. It is red and is supplied with Flangeless Fittitngs for 1/8" OD tubing, P-308 nut and P-300 ferrule.