Features. 0.75 in. Asme 30 lb pressure relief valve.. For hot water heating supply boilers.. Pressure protection only.. Standard pressure setting is 30 psi.. Maximum btu input at 30 psi is 650000 btu.. Bronze body construction.. 34 in. Female iron pipe x 34 in. Female iron pipe connections.. Dimension - 2 l x 2 w x 6 h in.. Item weight - 1.2 lbs.