Smooth operating and long wearing. Conical valve seat is inegral with the valve body, it cannot loosen and cause leakage. Valve body is solid brass, first nickel then chrome plated. All key interior parts are stainless steel for corrosion-free, non-stick operation. These are just some of the features which make Baum Air-Flo® Control Valve The standard by which others are judged. Note:Contains natural rubber Latex.