Meet the valve with industry-leading flow capabilities, the POWERVALVE! The Nitrous Supply POWERVALVE features a quick 1/4 turn locking on/off valve, a large 5/8 siphon tube, and a -8 outlet. It also features a racer safety and two gauge ports(one on each side). At the time of purchase the Racer Safety can be swapped, for no additional charge, with our Qwik Trik Racer Safety, to do so leave a comment in the comment box during checkout. Unlike most bottle valves this one is unique in that the outlet comes straight out the top providing the least resistance possible to the flow of the nitrous.