Black Polypropylene Bulkhead Fitting -  Supplied Loose
When using bulkhead fittings it is important to note that a sound, leak proof seal can be made on a curved surface, provided that the curve is not so great as to prevent an even contact of the sealing gasket circumference against the tank wall surface.

Installation cost:

½" - 1¼"     -- $15.00 ea

1½" - 3"      -- $20.00 ea

4"               -- $35.00 ea