Probably screwed the nipples in too far....only need to go enough to seal threads to hole.I made a DIY 5 gallon pail with horizontal nipples. I had issues with freezing, I believe when our power went out. I recall leaking nipples and my pail spit where the nipples were screwed in.
Quality of nipples? Pail too big? Poultry farmer?
Sorry, I thought I remember someone bring you PDZ over the border.No relatives in the US.