A carto will punch right threw those delrin caps as well.Ive done it with mine before.If you are talking about the beveled water faucet type ones?.
Yeah I tried that and these caps are pretty solid, plus this one is the only True MAP tank I have so I am going to go ahead and put some effort into getting it right the first time LOL At 28 bucks a pop they are too expensive to experiment on
Nate aka Darth Vapor