Review on 🏍️ Enhance Performance & Preserve Engine: 10 Pack Motorcycle Gas Cap Breather Tube Vent - Universal Fit for CRF, XR, CR, Quads & Off-road Bikes (Black-Blue) by Joshua Days

Wouldn't use them on a dirt bike as gas can leak onto your nuts. These are nice pipe ends, but 8 out of 10 are vented both ways to allow fluid to escape and the other 2 I either had to drill to work either way or throw them away. You guess which one. Still got 3 stars because they were good enough to let air into the gas tanks, my GoPed and the generator.