Groco TH Series Standard Length Bronze Thru Hull w/ NutGroco TH Series Thru Hulls are constructed of C83600 bronze and feature a NPSM / NPT combination thread. These thru hulls are available in a variety of sizes and come with a nut included. NPSM / NPT combination thread; C83600 bronze construction; UL listed 647B; Includes nut; Specifications:Part NumberThread NPSABCWeight (w/ Nut)TH-750W3/4"2.20"0.30"1.90"0.50 lbs.TH-1000W1"2.85"0.30"2.32"0.70 lbs.TH-1250W1-1/4"2.90"0.30"2.62"1.20 lbs.TH-1500W1-1/2"3.15"0.30"2.89"1.50 lbs.