Online Parts Store › Seachoice Chrome Plated Plastic Thru-Hull Image 1 of 1 Seachoice Chrome Plated Plastic Thru-Hull $12.24 Use in place of stainless steel thru-hulls. Not recommended for use below the waterline. Add To Cart Added! Use in place of stainless steel thru-hulls. Not recommended for use below the waterline. You Might Also Like 1/2" White Plastic Thru-Hull w/Broad Flange $6.70 Seachoice Stainless Steel Covered Thru-Hull $26.04 5/8" White Plastic Thru-Hull w/Broad Flange $4.34 Seachoice 90-Degree Thru-Hull Connector, Fits 1-1/2 in. ID Hose, 1-3/8 in. Max Hull $17.56 Seachoice 90-Degree Thru-Hull Connector, Fits 1-1/8 In. ID Hose, 1-3/8 In. Max Hull $20.78