Our Super Flangeless Fitting system is an ideal choice those connections that need to be broken frequently and tubing assemblies because they swage onto the tubing. The nut is manufactured from biocompatible PEEK and delivers excellent chemical resistance. It comes with a Tefzel (ETFE) ferrule and stainless steel locking ring. Our fitting has a 5/16-24 Flat-Bottom thread port configuration and is for 1/16"OD tubing. Our fitting system comes with a P-259 Super Flangeless Ferrule.