Forespar Marelon is the modern material for marine plumbing system.  It's non-corrosive proprietary formulation of polymer composite compounds uses resins and additives to produce an extremely strong marine-grade product that will not deteriorate like traditional bronze marine plumbing parts.  Safe to use above or below waterline.

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Forespar Marelon Y-Valves
Forespar Marelon Y-Valves

Plastic Plumbing Fittings

Forespar Lighting Master Static Dissipator