Online Parts Store › Seachoice Stainless Steel Covered Thru-Hull Image 1 of 1 Seachoice Stainless Steel Covered Thru-Hull $18.91 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 Chrome Plated Plastic Thru-Hull $12.24 Seachoice 90 Degree Plastic Thru-Hull, White $16.00 3/4" White Plastic Thru-Hull w/Broad Flange $4.71 Seachoice 90-Degree Thru-Hull Connector, Fits 1-1/8 In. ID Hose, 1-3/8 In. Max Hull $20.78 Seachoice Stainless Steel Covered Thru-Hull $14.56