I found that one of 2 of my cup nipples I installed on the pretzel container was leaking even though I took it off and used more plumbing tape on it. The package called for a 3/8" hole, but in that thin plastic the hole is fairly jagged. I think I will try it on PVC sometime in the near future. So for now, I gave the chicks a black plastic coffee can. 2 small holes at top of can to wire it to the hardware cloth. lol