I am installing a pump for a shower which requires a separate feed from the cold water tank. I have a plastic (50 gallon) tank in the loft and intend using brass tank connector with compression fitting into 22mm copper pipe (just like the existing feed to the hot water tank). Q1. What tool should I use to cut the hole in the tank (holesaw in a drill or hole cutter)? Q2. The hole need to be as low as possible. I obviously need to avoid internal structures (strengthening webs, etc.) but are there any other guidelines for positioning the hole? Q3. What do I use to seal the tank connector / tank joint? The tank connector comes with no washers - can it bolt straight on to the tank? Should I use a washer / silcone sealant?
Thanks in advance.