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Old 09-21-2012, 08:53 AM   #15
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Isn't there a vacume between the toilet and the tank? I think the plunger "sucks" the waste out on marine heads, which is why the waste tubing may be expensive.
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Old 09-21-2012, 09:10 AM   #16
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The pump draws the waste (and some fresh water) into a pumping chamber, which is then pumped under pressure on the back stroke into the waste tank. The upside down U in the discharge hose mentioned previously acts as a backflow preventer with the vacuum breaker in it allowing the column of waste which could be held by vacuum in the hose to flow by gravity into the waste tank.
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Old 09-25-2012, 03:20 PM   #17
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Here's a picture of a similar baby somewhat polished and without the mahogany seat and cover.

Holy, well.. crap! Impressive piece of hardware!

Still thinking about ways to do this... hoping I can bridge the gap between the pressurized system in the trailer, and the hand pump on the toilet.
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Old 09-25-2012, 04:10 PM   #18
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curious about the women and children

"old salts"? I am curious ladies and moms. whattaya think about using these "man art" contraptions versus the aforementioned piece of plastic? For my money, the thetford china bowl unit I recently bought is hands down better than these metal dinosaurs; FORM & FUNCTION better. Now, a carbon fiber bowl, with a flamed toilet seat would be a horse of a different color, and just wonderful.
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Old 09-25-2012, 04:42 PM   #19
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I have a Dometic Traveler Lite in my AS and I think it's perfect for an RV, which isn't a boat.

The electric water pump in a trailer will never be able to supply the required pressure to pump the waste like the lever driven pump does. You might be able to plumb an electric macerator pump to the bottom of the bowl and use it to pump the waste into the tank, but at this point you should be asking yourself whether all of this is really a good idea.

If it was me, I'd sell the marine head on Ebay and use the proceeds to buy a Dometic Traveler Lite that will just drop right into place and work from the gitgo for $175 or so.
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Old 10-24-2012, 12:50 PM   #20
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Thanks to everyone for weighing in. I tossed this same question onto a forum at the other end of the equation (sailboatowners.com) and wound up with a similar conclusion from a boat toilet expert.

RV systems are designed to push water in and out of the toilet, whereas the hand pumps in these marine heads aren't. So rather than fight the forces of these different systems - and considering the dwindling supply of repair parts on a 30 year old throne - I'm unfortunately going to sell this bronze one and stick with a modern porcelain RV-specific toilet.

I'll have to find a different way to express myself artistically in the washroom.
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Old 10-24-2012, 01:24 PM   #21
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Old 10-24-2012, 01:45 PM   #22
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This sailor thinks you've made a wise decision.
Aye aye, cap'n.
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Old 10-24-2012, 03:18 PM   #23
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Really a shame you could not come up with a way to make it work. Sure would have looked sharp.
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Old 10-24-2012, 04:10 PM   #24
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Hang a picture on the wall, with the caption: "My other toilet is a . . . . "

.
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Old 10-24-2012, 04:26 PM   #25
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Really a shame you could not come up with a way to make it work. Sure would have looked sharp.
I know, I'm kinda bummed - plus it would've made a killer story to brag about my creative recycling skills.


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Hang a picture on the wall, with the caption: "My other toilet is a . . . . "


Maybe I'll be brave (bored?) enough to build a custom mahogany seat for whatever I wind up with... or cast a vintage-looking pedal in aluminum.
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Old 10-25-2012, 08:51 AM   #26
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There you go - make a mahogany seat and cover for the RV model and varnish it up real pretty and you'll still have a loo to be admired, just not quite as cool as a polished bronze marine head.

BTW, buy the water saver option too if you get the Dometic. It's essentially a spray wand like you find at a kitchen sink and using it to clear the bowl when flushing results in much lower fresh water usage. After having mine for a while I now believe that all toilets should be equipped with this simple accessory because having a ready source of fresh water when cleaning the bowl is exceedingly handy.
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Old 10-25-2012, 09:04 AM   #27
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I know, I'm kinda bummed - plus it would've made a killer story to brag about my creative recycling skills.






Maybe I'll be brave (bored?) enough to build a custom mahogany seat for whatever I wind up with... or cast a vintage-looking pedal in aluminum.
Definitely!

Make that mahogany seat.

Then, for the rest of your new throne:

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Old 10-25-2012, 10:52 AM   #28
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RV systems are designed to push water in and out of the toilet, whereas the hand pumps in these marine heads aren't.
You've got it just backwards (if I understand what you're saying).

RV toilets operate like a glorified outhouse - the waste falls from the bowl into the tank below when the foot valve is opened and pressurized water is allowed in to clean the bowl. An RV toilet hooked up to an elevated water tank could be used to make a nicer outhouse.

Study the photo of the Blakes Baby to understand how a marine head works. The baby has separate pumps for flush water and waste ejection so it's operating functions are easily seen.

The T handle of the flush water pump when pulled upward draws flush water into that pump. A downward push pumps the water into the bowl.

The black handle of the waste ejection pump when pulled upward draws the waste and flush water mix from the bowl into the ejection pump. A downward push pumps the waste mix into the holding tank.

In the W-C head that you have, the two pumps have been replaced with one pump for both functions. The two different functions happen according to the position of the foot valve when the handle is operated. That's why it's possible to get fresh water contamination with that head since it was designed to use sea water for flushing rather than potable water. All marine heads operate using these two functions but there is a wide variety across models in the implementation.
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