I can appreciate what marlin has done for yota's. I buy **** from him because this is a dude you want to keep workin, an innovator. Not saying I've never used trailgear or won't in the future, but when I buy **** from trailgear I kinda feel dirty and don't want anybody to know.
There are 4 grades of copper pipe,each one is thicker wall. DWV,Type M,Type L,with Type K being the thickest. I would suggest type L,but M would prolly work fine also