Review on Replacement Kit Yellow Thickened Threaded Gasket by Jose Schweigert

If you want the caps supplied to cover the nozzle of your diesel jerry can these are good. If you want them to fit on a gas canister you will need to cut the cap off a bit so it screws in far enough to cover the nozzle. High quality plastic, seems sturdy as it will last a long time. The vent plugs fit snug and tight after the hole is drilled. Not leaking at all.