Furon® No O-Ring Union Fittings are designed for use in any welded PFA piping system in semiconductor, instrumentation, pharmaceutical and chemical processing industries. Applications include bulk chemical delivery, wet process, CMP, pipe manifolds, and valve boxes. Made of high-purity PFA, Furon® No O-Ring Union fittings are manufactured with our patent protected tongue and groove seal and No O-ring design, eliminating dead space, and elastomeric contamination. No O-Ring Unions are available in 1/2", 3/4", 1" and 2" sizes.