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Old 08-30-2016, 01:33 PM   #1
Bob Hudspeth's Avatar
City: Pacific Northwest (Washington)
Country: USA
Vessel Name: North Sea
Vessel Model: Rawson
Join Date: Jul 2015
Posts: 23
Bronze. thru-hull valve question

I have a 1972 Rawson that has multiple thru-hull valves. They are all bonded and functional, but I am concerned about the age. I am the fourth owner with no old maintenance records to look upon.
My question to you is whether or not a person could determine an actual need or not regarding replacement of valves, since replaceing just to replace for peace of mind seems a waste, but foolish not to if needed or just prudent maintenance.

They are the old style with a locking screw and lever.

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Old 08-30-2016, 02:03 PM   #2
djmarchand's Avatar
City: Litchfield, Ct/Punta Gorda, Fl
Country: USA
Vessel Model: Atlas Pompano 23
Join Date: Aug 2012
Posts: 4,698
I don't know what an old style with a locking screw and lever is. But if they are from 1972, they may be tapered plug sea cocks. These are robust and can be easily lapped to restore sealing and function. See Servicing Tapered Cone Seacocks Photo Gallery by Compass Marine How To at

But sea cocks can corrode, particularly if the bonding was compromised. I had a Perko ball valve seacock that the top came off in my hand with the boat in the water. That was scary until I got hauled and replaced it.

These ball valve types can't be serviced other than maybe to squirt some silicone grease to lubricate the ball. Take a hard look for corrosion and if you are on the hard you might want to unscrew the top to see if the threads are corroded. That is what happened to mine- the threads on the top bushing were gone.


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Old 08-31-2016, 05:30 AM   #3
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Join Date: Oct 2007
Posts: 19,521
Take a wire brush and clean a section.

If its Pink, its time for replacement , if bronze ,have no fear.
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