Our 4" Gruvlok x Weld nipples are steel. These fittings are designed to provide minimum pressure drop and uniform strength. They are also grooved to allow for some linear expansion and contraction as well as horizontal variance. These feature eliminate limited pipeline stresses without the use of costly expansion joints.
Please check out the rest of our store for more Gruvlok Couplings. Also check out the Hose Coupling category for King Nipples, Foot Valves, and Strainers & Skimmers as well.
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