This Robert Manufacturing brass float valve has a 1/2" female National Pipe Taper (NPT) inlet and its estimated rate of flow is 18 gallons per minute (gpm) at 35 pounds per square inch (psi) and 27 gpm at 85 psi. The valve inlet acts as the valve mounting mechanism. The valve is made of red brass for corrosion resistance and has a buna-N shut off disk for durability. The valve uses a 10" or 12" x 1/4" threaded rod and a 5" float ball (sold separately). This float valve is suitable for use in water level control applications that include water turbulence, such as in cooling towers and car washes.