i used to live in a house that had and old crab cooler in the back yard. at one time it had a drip system installed in it but it was long gone by the time i was there. it was 4 inches thick fully insulated. i did a changeout from an r12 to r22 condensor and evap. took home the old r-12 stuff and hooked it up in the box. ran a tap right out the side of the box. it worked great.