This PPS, Headless, Super Flangeless Nut is excellent for those connections that need to be broken frequently and tubing assemblies because they swage onto the tubing. this nut is manufactured from PPS (polyphenylene sulfide) which offers high tensil strength and excellent chemical resistance. It has a 1/4-28 Flat-Bottom port configuration and is for 1/8″ OD Tubing.