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Vented loop on head intake line

Studying a tad more and replacing my entire system. Do I need a vented loop on my water intake line to my head? Old system didn't have one but just curious if others use these.

Other question is this; I am taking out the Y valve because I'll never dump to the Great Lakes so with that originally being higher then the tank, should I make sure at some point that the 1 1/2" hose has a loop higher then the tank?

1985 O'Day 26'

I spent all my money on booze, boats and broads. And the rest of it, I wasted. - Elmore Leonard

Last edited by Bruce3966; 06-22-2015 at 09:07 AM.
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post #2 of 8 Old 05-19-2015 Thread Starter
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Re: Vented loop on head intake line

Never mind, found my answer.

1985 O'Day 26'

I spent all my money on booze, boats and broads. And the rest of it, I wasted. - Elmore Leonard
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Re: Vented loop on head intake line

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Originally Posted by Bruce3966 View Post
...Do I need a vented loop on my water intake line to my head? Old system didn't have one but just curious if others use these....
Is the head above or below the waterline?
The vented loop is usually on the "push" side of the pump, so between the pump and the bowl. If you put it before the pump it will suck in air.

Instructions here:
http://www.raritaneng.com/pdf_files/ph_II/L04v0505.pdf

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...Other question is this; I am taking out the Y valve because I'll never dump to the Great Lakes so with that originally being higher then the tank, should I make sure at some point that the 1 1/2" hose has a loop higher then the tank?
If you remove the Y, you'll only have one hose from the tank going up to the deck, right?
If you have a discharge seacock and will not use it you'll need to plug the hose above the waterline.
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post #4 of 8 Old 05-19-2015
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Re: Vented loop on head intake line

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Never mind, found my answer.
Please share your answer! I have the same question.

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Re: Vented loop on head intake line

SVTatia was correct. Vent loop only if below water line and on pump side if having a pump.

NEXT QUESTION---teflon tape, 4200, pipe dope or what to use on tank fittings? Just pulled the fitting and cleaned them all up from the PO using some type of pipe dope I think. Plastic to plastic should be teflon tape correct? I have to get this correct the first time. Replacing all hoses and the head itself. Tank is all cleaned out and ready to put it back in but need to know what to use on the fittings.

1985 O'Day 26'

I spent all my money on booze, boats and broads. And the rest of it, I wasted. - Elmore Leonard

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post #6 of 8 Old 05-19-2015
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Re: Vented loop on head intake line

Good question. My dear PO put a vented loop on the intake side. There is no pressure side on this Groco head. But of course it just sucked air which doesn't flush well. So his brilliant solution was to plug the little hole in the vent! Voila! Flushed perfectly! What a clever boy.

I put in an easy to operate by hand shutoff...

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Re: Vented loop on head intake line

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Good question. My dear PO put a vented loop on the intake side. There is no pressure side on this Groco head. But of course it just sucked air which doesn't flush well. So his brilliant solution was to plug the little hole in the vent! Voila! Flushed perfectly! What a clever boy.

I put in an easy to operate by hand shutoff...

I can top that. PO for my boat just put 16 air fresheners (yup 16) under the v-berth to try and get rid of the odor. Hilarious!

1985 O'Day 26'

I spent all my money on booze, boats and broads. And the rest of it, I wasted. - Elmore Leonard
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Re: Vented loop on head intake line

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Originally Posted by SVTatia View Post
Is the head above or below the waterline?
The vented loop is usually on the "push" side of the pump, so between the pump and the bowl. If you put it before the pump it will suck in air.

Instructions here:
http://www.raritaneng.com/pdf_files/ph_II/L04v0505.pdf



If you remove the Y, you'll only have one hose from the tank going up to the deck, right?
If you have a discharge seacock and will not use it you'll need to plug the hose above the waterline.
In reference to your statement to plug hose above waterline, I am replacing the thru-hull with a new base 4200'd to hull and then a flange adaptor and then a ball **** and just plugging the ball **** with NPT plug. The bottom line on the tank will go to the deck and the top line on the tank will go to the head. By all diagrams I have seen I will be putting a loop above the tank level for the inlet so there is no chance of backflowing into the head. That would be lovely!

1985 O'Day 26'

I spent all my money on booze, boats and broads. And the rest of it, I wasted. - Elmore Leonard

Last edited by Bruce3966; 06-22-2015 at 09:08 AM.
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