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S&S Swan Maintenance - Seacock, installing a new one
10 April 2021 - 14:20
Join Date: 03 February 2011
Posts: 39

Seacock, installing a new one

Hello, am about to install a Blake seacock for water to a water-on-deck pump.        It`s for flushing anchorchain and guess saltwater is also good for preserving the teak deck when exposed to high UV/temperatures. Well, the fine flush original mounting looks to have been done without any back-plate. And inside of hull, there is the cover of polyester and paint for topcoat.

Would such mounting be advisable for the mounting of a new valve, ie not using the back-plate?  Any advise on this would be appreciated.

Thorbjorn/Ravn 411/36



10 April 2021 - 15:11
Join Date: 29 January 2007
Posts: 1018

Dear Thorbjorn,

you are correct, there is no backing plate from outside. I think yu may have seen the instruction we have uploaded on with exact instruction, if you have missed it, here you are:

Please keep this Forum posted on your work in progress with photos and info.

Fair  winds,

matteo (47/069 Vanessa)

Preparation job for installing a new Blakes Seacock

B.S. has been installed, and top part laminated with polyester

New B.S. has finally been installed

14 May 2021 - 14:06
Join Date: 03 February 2011
Posts: 39

Dear Matteo, thank you for guide to very instructive thread.

Does the curing of materials require much time when hull is on land in normal temperature about 15 deg C?  Need to ask since boat will be hauled only for 3 - 4 days this year.   

Will take photos underway. Yard is reluctant to install without through hull bolts. And lots of Simpson mastic. 

Thorbjorn/Ravn 411/036




15 May 2021 - 07:41
Join Date: 29 January 2007
Posts: 1018

Dear Thorbjorn,

it is not really the temperature you have to check but the humidity, check  producer's instruction of the brand you are going to use and eventually try another which is suitably to you.

Blakes Seacock have been originally installed without any bolts by Nautor, and most of them are still there 50 and more years later, so, if job is properly done, they should not worry about.

To install a Blakes Seacock  you usually need about 4/5 hours of man power (not considering drying of materials, of course).

Thanks for keeping us posted on your progress!

Fair winds!

matteo (47/069 Vanessa


15 May 2021 - 15:15
Join Date: 05 August 2010
Posts: 162

This may be a bit incidental, but interesting nontheless.

One great advantage of the Blake seacock is the fact it can be dismantled. Well, it needs to be (for maintenance and lubricating), but it helps underway as well. In the last couple of years, we had two incidences of blocked seawater intakes for the engine. Since then, I am an even stronger supporter of Blakes, considering that it is possible to remove and inspect the functional part of the seacock from inside the boat while in the water (having a wooden plug handy, of course).

The water in Northern Germany is quite cold in spring, and I'm grateful for such an elegant way around a dive to free the intake ...

Martin (Vellamo, 48/039)

Plastic blocking Blake seacock

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