Double Thread Bulkheads accept threaded fittings on the tank side (water side) and on the outside. The threads on the exterior of the bulkhead are only for the bulkhead nut itself.
Our 3/4" Bulkheads require a 1-1/2" hole.
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A+ Review by Ryan
Quality Price Value
Shipment arrived fast, fitting was correct, and quality high. I will buy from jl again. (Posted on 12/20/2016)
Great Review by Ronald
Price Value Quality
Great product, exactly what I needed (Posted on 11/17/2015)