Easily installed on any air line. 2-way valve action permits use of either abrasive blast or air to clean spark plugs thoroughly. Single neoprene grommet expands or contracts to fit all plugs. 1/2" orifice designed to provide steady, vapor-like flow of abrasives over entire plug base. Easily mounted to wall, extending out approx. 3". 2-hole mounting base. With push-button control valve, approx. 4-1/2 oz. silicon carbide grit, retainer bag. Requires 125- to 130-psi air pressure.