Bulkhead Fittings Installation Instructions

Use a standard hole saw that fits any ¼” electric drill motor to cut the proper size hole in the fiberglass tank. A 2 1/8” hole is required for ½”, ¾”, and 1” threaded fittings. A 3 1/4” hole saw is required for 1¼”, 1½”, and 2”-bulkhead fittings.

Step 1. Place your finger through the fitting and install the body in the hole by placing one lug through the hole first. A slight tap with a hammer will slip the second lug through the hole.

Step 2. Flex the back-up washer through the hole and over the fitting body.

Step 3. Slip the grommet over the fitting body, but do not slide it all the way down the body at this point.

Step 4. While holding the fitting body with your finger, work the grommet down the fitting body until it is in the hole in the tank wall. (The grommet will protrude slightly on both the inside and outside of the tank.)

Step 5. Place the washer on the fitting and then install the nut. Tighten until snug. (Note that nut is left-hand threaded!) Sealing is accomplished by the grommet expanding against the circumference of the hole you cut in the tank.