These unique thru-hulls are CNC machined with straight pipe thread which blends into NPT tapered pipe thread for the last four threads so they mate with virtually any piping or valve without the need for adapter connections to make a good seal.
o Generous neck lengths, threaded close to the flange, accommodate a variety of hull thicknesses
o Machined sealant groove on the back of the flange to prevent leakage
o Made of 85-5-5-5 naval bronze
o Very sturdy wall thickness
o Complete with flanged jam nut
o Internal wrench lugs to aid in tightening nut during installation