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The Definitive Guide to valves and fittings

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The put in coupling housing encases the gasket and engages the grooves round the pipe to create a leakproof seal within a self-restrained pipe joint. There are two varieties of grooved coupling; a versatile coupling will allow a constrained degree of angular movement, as well as a rigid coupling does http://gregoryamvdi.acidblog.net/16932114/the-basic-principles-of-valves-and-fittings

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