Online Parts Store › Seachoice Stainless Steel Covered Thru-Hull Image 1 of 1 Seachoice Stainless Steel Covered Thru-Hull $12.81 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 5/8" White Plastic Thru-Hull w/Broad Flange $4.34 Seachoice 90-Degree Angled Thru-Hull Connector, White Finish, 0.75 in. $9.78 Seachoice Stainless Steel Covered Thru-Hull $26.04 1/2" White Plastic Thru-Hull w/Broad Flange $6.70 1-1/8" White Plastic Thru-Hull w/Broad Flange $9.81