A power vent enables air to get out during the downstroke, but prevents for air being sucked back into the crankcase on the upstroke of the pistons. This prevents for excessive crankcase pressure, reduces the chance on leaking gaskets, and improves performance and throttle response. This in-line power vent is made from billet aluminum with a chrome finish, has two 3/8" (10mm) hose connectors, is just 1 1/4" (32mm) in diameter and features a replaceable rubber umbrella valve. Comes complete with two hose clamps.