Basic in design, but big on performance!Sporting the same quality internal components and unique features found in all GFB valves, the Basic is actually the highest flowing valve in the universal range. The 5-hole pattern ensures a huge venting area and free-flowing air path.Other valves on the market may look like the Basic, but rest assured, size for size the Basic will out-flow most of them by up to 40%. Because of the free-flowing characteristics, this valve is not as loud as the Mach 1 or Bovus Maximus. This does however, make it a good choice for big horsepower engines.Standard fittings:Base: suits 33-35mm hose or 1" pipe (5035)Hose Plug: 30mm (5530)For alternative fittings or adaptors, click here. Colours available: red, blue, silver or black.