At Sanvo Pipes & Fittings we pride ourselves on our superior quality and service. For customers with different manufacturing needs of steel pipe coupling/sockets, we provide carbon steel coupling, black steel coupling, galvanized pipe nipples, stainless steel pipe nipples, seamless pipe nipples, brass pipe nipples, aluminum pipe nipples,forged coupling, steel coupler, 4 inch steel pipe coupling, steel pipe socket, black steel coupling, internal threaded pipe, carbon steel pipe sockets and stainless steel pipe couplings. Our pipe nipples and couplings are available in the following size: 1/8 ", 1/4 ", 3/8 ", 1/2 ", 3/4 ", 1 ", 1-1/4", 1-1/2 ", 2 ", 2-1/2 ", 3 ", 4 ", 5", 6 ".