0framistan 10 years ago If it is used for drinking water, be carefull what glues you use. Must be FOOD SAFE glue. I dont think you will find anything food-safe that will also adhere. If it is just a smallish hole, could you place a stainless steel BOLT through it and a foodsafe rubber washer then tighten it. Or re-purpose the tank for a non-drinkingwater use.