The gas valve won't turn. I've applied Blaster for lubrication and purchased a gas water key, but the valve remains immovable. My first attempt with a crescent wrench was unsuccessful. Can anyone suggest Master On Off Valve ADA American Dental Accessories, Inc. Locate Main Water Shut Off Valve Reliant Plumbing Cross Handle Angle Stop Shut Off Valve, 1 2 Copper Pipe Inlet with 3 8 Compression Outlet Westbrass VEVOR 10 Pack Angle Stop Valve 1 4 Turn Water Shut Off Valves 1 2in Nominal (5 8in OD) Compression Inlet x 3 8in OD Compression Outlet Shutoff Valve for Bathroom Kitchen Toilet Shower Plumbing in the Homewerks 3 4 in. FIP X 3 4 in. FIP Brass Stop Valve Mfr# 230 2 34 Ace Hardware