Groco Bronze Hose Thru-Hull Fitting Groco bronze thru-hull fittings are constructed of durable C83600 bronze and are available in a range of sizes. NPS thread with hose connection UL Listed 647B Specifications Part Number Thread NPS Hose ID A B C D E Weight HTH-500 12 12 2.7 0.3 1.7 1.1 1.3 0.4 lbs. HTH-625 34 58 2.7 0.3 1.9 1.1 1.3 0.6 lbs. HTH-1000 1 1 2.8 0.3 2.3 1.2 1.3 1.1 lbs. HTH-1250 1-14 1-14 2.8 0.3 2.6 1.1 1.3 1.2 lbs. HTH-1500 1-12 1-12 2.8 0.3 2.9 1.1 1.3 1.5 lbs. California Residen