Enlarging bulkhead hole

[Doug]

Its a loss of space for the larger overflow but the safest way to go. And with the 4 I can do a 3/4in. return through one of the smaller bottom holes.

So a 1in. main full drain line...........a 1in. air intake 2nd drain line..........a 1in. but bumped up from a 1/2in. bulkhead, safety drain......and a 1/2in. bulkhead bumped to 3/4in. return line which is a perfect for for my Mag 12