Five Oceans 3/4" NPT Thru-hull Stainless Steel FO-377 PIPE THREAD TYPE - 3/4" NPT (American National Standard Taper Pipe Thread). MADE FROM high-quality AISI316 Stainless Steel TAPERED for sealing, often without any thread sealant; for connections in nearly every type of service TOTAL LENGTH: 2 7/8" (74mm) FLANGE DIAMETER: 2" (50mm) FLANGE HOLE THICKNESS: 1/8" (5mm)