I have 2 15.5 gallon stainless steel kegs with the tops cut out, they both have a hole punched for 1" electric element and 2 holes punched for 1/2 bulkheads. All holes are punched as close to the bottom as possible. 1 keg is rubber coated one is not. I started to solder a 1" nut on the bare keg and decided to go another route.
40$ each.
40$ each.