Six Reasons to Replace Bronze Seacocks with Composite Seacocks

Seacocks and thru hulls have traditionally been manufactured in bronze and served their purpose on vessels brass-seacock

circa 1900. The vessels of that era, relied on basic kerosene lamps for lighting, meth-burning stoves for cooking and had no electronics, internal electrical generation capabilities, circuit boards or anything that could cause electrolysis and corrosion to damage the bronze fittings.

Today, with the addition of mixed metals used below the water line and advanced electrical systems including; gensets, air-conditioning, shore power and close-proximity moorings in marinas; electrolysis and corrosion has become a major problem. This together with some thru hulls and seacocks manufactured from brass has made that issue become much more serious. Bonding (typically Zinc for salt water, Magnesium in fresh water applications) has been the only way to avoid failure through electrolysis and corrosion. However, in the case of brass fittings such as thru hulls and seacocks this to no avail.

Now, in the 21st century composite materials have become the changing force in the manufacture of thru hulls, seacocks and associated plumbing fittings. Here are 6 reasons for replacing your bronze seacock with Tru-Design composite seacock:

  1. Tru Design materials are immune to electrolysis and corrosion
  2. Tru Design seacocks are light weight and strong.
  3. Tru Design seacocks do not pit or jam due to its Teflon™ impregnated ball.
  4. Lubricants are not necessary to ensure long lasting operation
  5. Unlike traditional flanged seacocks, Tru Design’s ABYC H-27 rated seacock assemblies do not require any additional fasteners on or through the hull.
  6. Eliminating the need for backer blocks speeds the installation process saving valuable time and money.

load-bearing-seacock 4WGZFSAll these attributes make composite fittings ideally suited to the salt laden harsh marine environment.

A thru hull fitting has a straight (parallel) thread so that a lock nut can secure it to the hull. The seacock must also have a straight (parallel) thread as it screws down on to the thru hull fitting which relies on a long thread engagement to make a good strong seal between the thru hull fitting and seacock assembly.

TruDesign thru hulls and seacocks are supplied with either NPS (national pipe straight) or BSP (British standard pipe) threads to suit all requirements around the world. The most important thing to remember when fitting seacocks to thru hulls is to never use a seacock with a tapered thread as the engagement on the straight thru hull fitting becomes very short hence weak and prone to leakage.

Load Bearing Collars has changed the traditional way we think of mounting a thru hull and seacock assembly. The load bearing collar adds strength to this very critical assembly on a vessel.

Traditional seacocks use additional mounting bolts (typically three) on a flanged base through the hull to ensure they meet ABYC standards, whilst the TruDesign Load Bearing Collar simply spreads the load force without the need to drill additional holes ensuring a neat, light weight yet compliant assembly.

seacock-comparison fnbpk3

Raritan Is the Only Authorized Distributor of TruDesign Products In the USA