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Old 26-02-2013, 05:39   #1
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Bilge Pump

I have a manual bilge pump on my 24 foot sloop. Can I tap into the exit hose with a one way valve to install an electic pump in the bilge or do I need to install a separate thru hull fitting?
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Old 26-02-2013, 06:11   #2
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Re: Bilge Pump

I would think that most will suggest that the best practice is to have two totally separate pumps,- manual and electric; however, it's not uncommon to find one effluent through-hull from two sources. With a "Y" or "T" merging the outflow just before the through-hull each hose should have it's own vented loop. I think the vented loop preventing seawater from entering is a better choice than a one-way valve.
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Old 26-02-2013, 06:46   #3
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Re: Bilge Pump

It can by Y-ed. The valves close to the Y and the Y close to the exit.

But many people prefer separate exits. I think it is a good practice for any bigger installation.

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Old 26-02-2013, 07:10   #4
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Re: Bilge Pump

You want one thru-hull per pump. Checkvalves can fail.
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Old 26-02-2013, 19:20   #5
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Re: Bilge Pump

If you happened to be constrained to use a single outlet and the pumps will not run simultaneously, you could consider using a normal valve (as opposed to check valve) in the elec pump line.

You'd normally leave that one open, only closing it when you use the manual pump on its own. The elec bilge pump running will not push water into the manual pump because the latter has a one-way exit valve.
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Old 26-02-2013, 20:50   #6
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Re: Bilge Pump

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Originally Posted by Marqus View Post
........................ you could consider using a normal valve (as opposed to check valve)......................
By "normal valve" do you mean a Y-valve with a lever that selects one passage or the other? If that is the case I think it would be suitable and an excellent suggestion, but the same action can be accomplished with a passive system where both effluent hoses are left open and each with their own vented loop.
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