Review on 🔵 YOKEPO Billet Gas Fuel Cap Air Vent Hose Tube Breather - Motorcycle Motocross Pit Dirt Bike (blue-1) by Alan Estell

The hose was cut a little crooked so I had to cut it a bit more which made it a little shorter than I wanted. The one-way valve seems to be working. To test this, I simply blew into the tube while holding it vertically, then tilted it so the tip was pointing down (to mimic the cylinder when it was inverted) and the valve was blocking the air I was holding had blown in. If it can block air, I'm pretty sure it's blocking gas. My lid has a built in one way valve so it doesn't really bother me. It's cheap, but so far it seems worth it. I bought a Protapers handlebar and want to use a dampening pad that will eliminate the small hole in the dash that a long tube would normally fit. That's the main reason I bought it and so far it's working fine.