Specification Material: Brass Model: 1/4Inch Diameter: 13 mm/0.5 inch Containing products: 2PCS 1/4 air tank drain valve Weight: 30g Material: brass. Diameter: 13 mm/0.5 inch. Screw adjustment design, easy to use and install, easy to use, widely used in low-noise air pumps, woodworking paint compressors, etc. Replace the old or damaged oil drain cock on the compressor oil tank. Before replacing the drain cock, evacuate air from the tank. Cannot be closed before draining. The drain cock is rust-proof, not as easily corroded as other materials, high temperature resistance, good ductility, and low magnetic permeability.