The No O-ring union fittings are specifically made for use in any welded PFA piping system that is found in pharmaceutical, chemical and instrumentation industries. These fittings are also utilized in applications such as massive chemical delivery, wet process and valve boxes to name a few. Fabricated from pure PFA, they are constructed with an innovative protected tongue and groove seal design that prevents elastomeric contamination and eradicates blank space. The diameters of these fittings come in 1/2'', 3/4'', 1'' and 2'' sizes. It possesses a pressure seal measured 120 PSI and can withstand and operating temperature of up to 300°F.