Marinco Adapters are thoroughly tested and inspected to insure highest quality. Dielectric and continuity tests are run before and after molding on each adapter. All products are visually inspected prior to shipment. Designed specifically for marine use. Highest grade materials. Rugged durability. Safe, efficient use. All wire is UL listed and oil and moisture resistant. Wire gauge is selected according to device rating. Molded portions are yellow vinyl jacketing compound.