Manual Two-Way Ball Valve, Body Material Bronze, For Media Air, Steam, Water, Valve Construction Two-Piece, Nominal Valve Size 3/4 in, Valve Body Style Straight, 3-A Standard Compliance Not Rated, Average Surface Roughness (Ra) Not Applicable, Maximum Pressure - Operating 600 psi, Maximum Pressure - Steam 600 psi, Maximum Pressure - Combustible Gas Not Rated, Vacuum Service Rating Not Applicable, Ball Material Chrome-Plated Brass, Ball Port Style Full Port, Handle Type Lever Bronze is an alloy consisting of copper and mostly tin, but can also include other metals such as aluminum, manganese, or phosphorous. This bronze valve is harder than brass, and can resist corrosion and metal fatigue better than steel.