This Dixon SCM28 brass speed control muffler has a 1/4" male National Pipe Taper (NPT) thread inlet and adjusts exhaust air flow to control air tool speed and sound level using an adjustment screw and locking nut. Its brass construction provides corrosion resistance, ductility at high temperatures, and low magnetic permeability. It has a 300 pounds per square inch (psi) maximum working pressure at 70 degrees F and a 35 to 300 degrees F operating temperature range. This speed control muffler is suitable for use with air tools such as drills and pavement breakers.Hose fittings connect, control, change the direction of, and terminate the flow in piping and hose systems. They are made of brass, stainless steel, galvanized steel, and other materials that resist corrosion, pressure, and wear. Hose fittings have various types of connections, including threaded, barbed, push-to-connect, dry disconnect, and others including those based on internationally-accepted specifications. Hose fittings are used in systems such as air compressors, automatic manufacturing operations, aircraft controls, and tire installation in industries including agriculture, mining, road construction, firefighting, and aviation.Dixon Valve & Coupling Company manufactures pipe and hose fittings and accessories. The company, founded in 1916, is headquartered in Chestertown, MD.