I've never had a piece that's had resin in it, I'm not that experienced :sadcrying . I just had a couple ideas.

What if you put a little valve on the mouthpiece of a pipe/bong/whatever so that it's impossible to blow shit the wrong way if you start coughing while hitting?

What if you put a little valve on the end of the bong stem so that you don't accidentally get water up in there???

Do these ideas seem reasonable???