It's not actually a water heater like people are thinking I think it is some sort of expansion tank for radiator type heat, it's galvanized and maybe 18 inches in diameter, right now it is a galvanized piece of pipe 18 inches in diameter after I cut it in half and cut the end out of it ,I was thinking of someone on here that used sonatubes for swarm traps I don't see much difference and this one has already caught one swarm, I have a couple of nucs I built ,one of which caught a swarm last year I don't know if I'll have time to build any more this year it sounds like we are going to start working 7 days a week again.