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BS336 BSRT round thread suction fittings in aluminium or gunmetal are the standard suction side couplings for the UK fire brigades. The male thread is used at one end of the hose whilst a female is used at the other.
BS336 round thread male couplings are significantly more substantial than standard round thread male couplings. This ensures that they do not fail in operation and thus endangering the life of fire fighters.Aluminium BS336 BSRT round thread fittings are used for fresh water applications whilst the Gunmetal version is used for salt water.