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Old 19-05-2011, 10:15   #1
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What Tubing for Cockpit Drains ?

I need to replace my out bad hoses for my cockpit drains. They are 1.5 inch hose. What is the correct hose to use? How many clamps do I need to use on the seacocks that are below the water line?
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Old 19-05-2011, 12:43   #2
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Re: What tubing for cockpit drains?

I’d use Shields “Vac Extra Heavy Duty”, Series No. 148 or 146
If you have a very difficult (“bendy”) installation, I’d reluctantly use “Vac Standard”, Series No. 140

Shields ➥ Bilge/Livewell | Teleflex Marine
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Trident equivalent Trident Marine: Bilge, Live Well & Drain

Below waterline hoses require double clamps.
If the barbed fitting is long enough, I’d double all hose clamps.
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Old 19-05-2011, 13:08   #3
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Re: What tubing for cockpit drains?

I would use a wire wrapped rubber hose, designated for engine water intake - like Shieldsflex II Marine Water/Exhaust Hose (w/wire) – Series No. 250

The hose Gord recommends above is ok, but is a pvc 'sanitation/freshwater' hose, which I have found can get brittle over time and is more heat sensitive (important if these hoses run anywhere near the engine), and harder to cut accidentally (you really need a hack saw to cut it)

In either case, put double hose clamps on the bottom end. You don't want these coming loose.
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Old 20-05-2011, 09:45   #4
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Re: What Tubing for Cockpit Drains ?

Am I confused or are you saying your cockpit drains are hooked up to below water seacocks? I guess that could work, but it sure seems they would be more free flowing if they exited above the waterline. That is the setup on my current and previous boat.
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Old 20-05-2011, 09:59   #5
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Re: What Tubing for Cockpit Drains ?

Shieldsflex II Marine Water/Exhaust Hose (w/wire) – Series No. 250
Shieldsflex II Marine Water/Exhaust Hose (w/wire)
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Old 20-05-2011, 10:16   #6
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Re: What Tubing for Cockpit Drains ?

The Drains should be crossing over. The Port drain, drains out the stbd side of the vessel and visa versa. Some boats the Cockpit drains out the stern. This all depends on the height of the Cockpit deck is above the water line, when the vessel is heeled over to her natural sailing angle. So really making generic comments on how a vessel should drain without the blue prints of said vessel, is hard to do.
But you may also want a check valve in the drain line. To prevent water from flowing into the cockpit.
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Old 20-05-2011, 11:40   #7
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Quote:
Originally Posted by Eric M
Am I confused or are you saying your cockpit drains are hooked up to below water seacocks? I guess that could work, but it sure seems they would be more free flowing if they exited above the waterline. That is the setup on my current and previous boat.
Mine is a 1976 boat, very well built, but the cockpit drains are designed to cross over and exit below the water line via some very substantial bronze seacocks. Whereas the bilge pumps exit above the water line. The old hoses are rubber and definitely need replacement!
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Old 20-05-2011, 11:50   #8
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Re: What Tubing for Cockpit Drains ?

I would follow estarsinger recommendation, use engine hoses, you don't want these to fail, double clamp anything called bilge, thruhull or drain. if they crossed before cross them again, follow builders design exactly, they had a good reason for the way they did it.
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Old 20-05-2011, 16:34   #9
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Re: What Tubing for Cockpit Drains ?

Quote:
Originally Posted by boasun View Post
... making generic comments on how a vessel should drain without the blue prints of said vessel, is hard to do.
But you may also want a check valve in the drain line. To prevent water from flowing into the cockpit.
I'd NEVER recommend installing a check valve in a drain line (cockpit, bilge, etc).
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Old 20-05-2011, 16:41   #10
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pirate Re: What Tubing for Cockpit Drains ?

Quote:
Originally Posted by boasun View Post
But you may also want a check valve in the drain line. To prevent water from flowing into the cockpit.
If that happens.... your probably sinking....
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Old 20-05-2011, 17:06   #11
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Re: What Tubing for Cockpit Drains ?

Check valves can stick and reduce flow....that is why.
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Old 21-05-2011, 22:56   #12
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Check valves are not necessary if the tubing is crossed. In order for water flow backwards into the cockpit the drain will have to be below the waterline. On my boat I would have abandoned ship by this time. I believe ABYC rules are the drains have to be large enough to drain the cockpit in a couple of minutes
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Old 22-05-2011, 01:31   #13
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Re: What Tubing for Cockpit Drains ?

I use corrugated engine exhaust hose. We have 2" drains that exit through the transom, above waterline. When we get big enough seas on the stern, the occasional breaker creates such a back-slap through the system that all kind of stuff comes out these drains, like wine corks etc.

Little crabs live there, until eaten by the ships cats

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Old 25-05-2011, 10:42   #14
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I found some trident-flex 1 1/2 inch hose for $1.50 a foot! Wire reinforced at that. All fitted now and looking good.
Next project is fitting a instant on water heater.
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