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Marine Standards

Marine Standards

All boats must now conform to a wide range of compulsory ISO standards. The standard for metallic seacock's and through hull fittings (IS0 9093-1) states: 'Materials used shall be corrosion resistant...'

Galvanic Corrosion

In traditional metals used on boats when immersed in seawater there is a tendency for the zinc-rich phase in brass, and its modified versions, to be leached away, leaving the copper-rich phase behind. This process is commonly known as pinking as it leaves your brass with a pinkish hue.

How This Happens

Copper has little strength, especially as loss of the zinc leaves it spongy, and the component will fail when this happens; therefore it is advisable that regular inspections of your brass and bronze hardware are carried out.
The answer to this problem is DZR (Dezincification Resistant) Brasses. These have a carefully controlled zinc level with other added elements to make the alloy a lot more resistant to the corrosive effects of the environment and electrolysis.
However, the answer to the dezincification problem has been known for 50 years and dezincification resistant brasses have been available for almost that len


Regular Inspections are vital in any fixture that controls to flow of water through your hull. Yacht Chandlers would also recommend keeping a tapered bung of matching diameter to the seacock so that in the event of failure the hole can be plugged quickly.


Plastic Fittings use super strong reinforced nylon materials to ensure you the longevity of a alloy fittings at a fraction of the cost. Less aesthetically pleasing than their brass or counterparts they are more suited to hidden plumbing areas.

Always consider the likely strain on the chosen plumbing system when selecting the material of your fittings. Areas subject to high levels of stress require the strength of metal alloy. Where smaller more flexable parts are required the cheaper nylon alternative is just what you need.