Premium quality Guidi thru-hull made from brass. Brass alloys contain higher levels of zinc and therefore are more suited to above waterline and fresh water applications. Thread : G = ISO 228/1 (BS 2779) BSP RINA Validated All thru-hull fittings should be electrically bonded to help prevent galvanic corrosion. See 1145 series for bonding washers & terminals THREAD : G = ISO 228/1 (BS 2779) BSP RINA Validated All thru-hull fittings should be electrically bonded to help prevent galvanic corrosion. See 1145 series for bonding washers & terminals
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