.A.Y. MCDONALD MFG. COMPANY is the leading manufacturer of Plug and Ball style Gas Meter Shutoff Valves utilized in both residential and commercial applications up to 175 PSIG. A.Y. McDonald offers a variety of Integral Valve and Standard Configuration Meter Bars, including single and multiple residential By-Pass Meter Bars and the newly developed Industrial By-Pass Bar. A full line of straight and off-set Meter Swivels, Meter Nuts, Meter Plugs and 3 Part Unions are also available. Setting the standard of safety, traceability tags provide accountability with a barcode that meets ASTM F-289714.