1-1/2\” O-Ring Union, 3000# Threaded Stainless Steel 316/316L A/SA182 NPT (National Pipe Thread Taper) Threads Teflon SEAL Contact us for other O-Ring Union options including: O-Ring Seals: Teflon, EPDM, Neoprene Materials: Carbon Steel, Brass, Aluminum, Titanium, Monel, Hastelloy, Copper Nickel Other options: Orifice Unions, Dielectric Unions, Hammer Unions