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The SHURJOINT® model 79 Wildcat coupling is designed to mechanically to join plain end or beveled end carbon steel pipe. The Wildcat couplings can be used for a variety of applications including mining, process piping, manifold piping and oilfield services. The Wildcat couplings feature case-hardened jaws within the housings and large diameter heat treated track bolts that when tightened securely grip the pipe surface. As with grooved couplings, a C-shaped rubber gasket effectively seals the pipe ends. (For sizes larger than 14 in (350 mm), jaws are made of 17-4PH stainless steel.). The model 79 coupling is recommended for use on carbon steel pipe with a hardness less than HB150, not recommended for stainless steel, plastic, HDPE cast iron or other brittle pipe.