Glass-reinforced nylon MarelonR fittings are lighter than bronze and not subject to galvanic corrosion.
For use above or below the waterline, Marelon fittings like these Mushroom Head Thru-Hull Fittings with Hose Barb are designed for years of trouble-free use. They are extremely durable, strong and unlike heavier bronze fittings, not subject to galvanic corrosion. For use above or below the waterline.