Online Parts Store › Seachoice Stainless Steel Covered Thru-Hull Image 1 of 1 Seachoice Stainless Steel Covered Thru-Hull $19.42 Molded from polypropylene with glass fiber for strength. Not recommended for use below the waterline. Add To Cart Added! Molded from polypropylene with glass fiber for strength. Not recommended for use below the waterline. You Might Also Like Seachoice Stainless Steel Covered Thru-Hull $14.35 Seachoice Mega-Flow Dripless Thru Hull Fitting, 316 Stainless Steel, Fits 1-1/8 in. Hose, 1-1/2 in. Max. Hull $94.55 Seachoice Mega-Flow Dripless Thru Hull Fitting, 316 Stainless Steel, Fits 1 in. Hose, 1-1/2 in. Max. Hull $79.23 Seachoice Mega-Flow Dripless Thru Hull Fitting, 316 Stainless Steel, Fits 3/4 in. Hose, 1-1/2 in. Max. Hull $80.25 Seachoice Stainless Steel Covered Thru-Hull $12.81