I much prefer the cap design. All mine were connected to the can so you would not lose them. I did ones time forget it was open and ended up dumping a bunch of

I much prefer the cap design. All mine were connected to the can so you would not lose them. I did ones time forget it was open and ended up dumping a bunch of diesel on myself. The nice part of the cap design is you can widen the hole slightly and get a much faster poor where most Air tube designs are small and incredibly slow.