Fixed orifice DZR brass double regulating valve. Intended for HVAC use. Threaded F/F (ASME B1.20.1 - NPT) or solder joint ends (ASME B16.22). Design according to BS7350. Tolerance on nominal Cvs +3% (test according to BS7350). 300 WOG (Maximum 300psi up to 160°F. Maximum 150psi at 260°F.)