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Old 09-04-2012, 11:23 AM   #21
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Re: Water tank guesstimate and plumbing question

Use rv fittings for outlet of black tank which is 3 inch, and while you are at it, get a combination one that has both black and grey water valves on each side of the discharge valve that hooks up to the hose.
Normal grey water is 1 1/2 inch in to the tank and often expanded to 3 inch before the discharge valve...
Dont forget to vent the tanks. Some people like 1 1/2 inch for vents... me i use 1 inch flexible line which works just fine...
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Old 09-04-2012, 01:40 PM   #22
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Re: Water tank guesstimate and plumbing question

Thank You Chev49 for the quick response.. $754 worth of Tanks are on order from Plastic mart and I plan on using your recommendations on the install. Thanks Again
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Old 11-05-2012, 04:30 PM   #23
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Re: Water tank guesstimate and plumbing question

I have the Black water tank with 3 inch inlet and outlet, however they are on the same end of the tank. My question now is should the inlet be on the opposite end on the outlet or does it matter?
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Old 11-06-2012, 07:14 PM   #24
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Re: Water tank guesstimate and plumbing question

John,
So poetic
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Old 11-06-2012, 09:22 PM   #25
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Re: Water tank guesstimate and plumbing question

Quote:
Originally Posted by Iceni John
... I put a 3/4" water inlet in the top of my poo tank directly above its outlet. I can either connect a hose to it and blast 65 PSI city water down there (obviously through a check valve), or I can pump excess gray water from the gray tank into there (again, though a check valve)...
Anyone who does a similar project... please remember the CHECK VALVE!!!!


Because we sit still, the paper/poo does not slosh around and break up like when traveling down the road. A flusher (with CHECK VALVE) would be great to have and we will add one when we build a new black tank. The new black tank will also not have our current problem... a 3" outlet that reduces to a 2.5" gate valve. Gate valve is great, the reduction isn't. 2.5" isn't a problem, the reduction is. But we knew the black tank was only to be used until we built a new tank.

As for 65 PSI.... been in many campgrounds with low water pressure. Keep that in mind when setting up a tank flush system.
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Old 11-06-2012, 09:33 PM   #26
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Re: Water tank guesstimate and plumbing question

id go plastic instead of metal for tanks.
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Old 11-06-2012, 10:14 PM   #27
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Re: Water tank guesstimate and plumbing question

IJ, couldn't have said it better
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