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Series BD Brass Boiler Drain Shutoffs are for use in commercial and residential hydronic heating systems. It consists of a brass body construction with 3/4 in. (20mm) hose thread connection on outlet side, Teflon stem packing, and cast iron handwheel. Available in various dual solder or IP connection models, and angle or straight pattern models. Maximum Pressure: 200psi (13.8 bar) WOG.