Hey guys, this is my first time dealing with setting up bulkheads and I'v got some questions. Is the rubber O ring that comes with the bulkhead supposed to be on the top of the bulkhead inside the tank? Or on the bottom of the bulkhead outside the tank? Also, does everyone use silicon to make sure it does not leak? Or just tighten it up?
another newb question, I am assuming that the bigger drilled hole is the exit and the smaller is the return?