Standard Thread Bulkheads accept threaded fittings on the tank side (water side) and slip pipe on the outside. The threads on the exterior of the bulkhead are only for the bulkhead nut itself.
Our 1-1/2" Bulkheads require a 2-1/2" hole.
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Good but... Review by Tim
Price Value Quality
Okay so I ordered 2 of these as i was drilling one new hole in my tank to upgrade from a durso to herbie drain. I already had the durso but decided it might be good to have a spare bulkhead in my spares collection. When they arrived one unit was good and went into the tank no problems. The other unit was stuck. I could not move the nut at all ( i did not put tools on it as this was a new bulk head and should have been free turning). So i contacted JL and they were awsome! Sent me a replacement unit and i had it the next day. The new unit is perfect.
Thanks JL and staff!
These units seal with no problems. (Posted on 12/5/2015)