Power Tank Monster Valves, 4 Valves w/ Coupler You won't believe your eyes when you see a tire being deflated through our newest go fast product called Monster Valves. These valves allow a 35x12.50x15 tire to be deflated about 1 PSI / second which is faster than a coreless valve stem. They are installed on your alum. or steel wheels as a second valve stem. You install them without removing your tire from the rim so it's quick and easy taking 10 minutes per wheel average. You will need a 1/4 pipe tap and a drill and a 7/16 drill bit. If you need a 1/4 tap we sell very high quality ones at a reasonable price (#MV-TAP). They are completely rebuild able and feature a core removal tool dust cap. Monster valves are recommended for 35 and larger tires. Power Tank, the company with the fastest INFLATION system now has the fastest DEFLATION system too.