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Old 05-14-2017, 05:01 PM   #1
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Plumbing how-to?

A while back someone posted a web page with a how-to on plumbing, had drawings of typical systems and such. Anyone save the link?
I know what I need to do, but it helps to jog the memory to see the drawings.
Thanks

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Old 05-14-2017, 06:06 PM   #2
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No but I am going to keep an eye out here in case someone does.

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Old 05-15-2017, 01:09 PM   #3
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No but I am going to keep an eye out here in case someone does.

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Same here, plumbing scares me more that electricity.
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Old 05-15-2017, 03:18 PM   #4
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http://www.rv-insight.com/RV-Plumbing.html

Don't know if its the one you are talking about but I have found the following link to be very informative.
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Old 05-15-2017, 05:26 PM   #5
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I assume that both gray and black tanks need to be vented?

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Old 05-15-2017, 05:39 PM   #6
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The article states that the grey water tank should be vented through the roof to prevent smells in the living space however it does not mention a vent for the black tank. But with the little I know I believe it also should be vented unless your waste gate has a vent of its own.
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Old 05-15-2017, 05:41 PM   #7
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In my house everything is vented, but I have never built an RV before lol. I am a bit away, but I figure I should know.

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Old 05-16-2017, 04:31 AM   #8
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Here's another source

Water System — Buslandia
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Old 05-16-2017, 05:01 AM   #9
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I assume that both gray and black tanks need to be vented?
Yes. Having an air admittance valve is also important (in most systems) for good flow.
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Old 05-16-2017, 05:02 AM   #10
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Something like a one-way vent?

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Old 05-18-2017, 07:59 AM   #11
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RV Plumbing | Fresh Water Tank | Dump Tanks | Water Heater | Grey

Don't know if its the one you are talking about but I have found the following link to be very informative.
Am I missing something? There is no connection for feed water to the hot water heater? That can't be correct.
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Old 05-18-2017, 10:36 AM   #12
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Am I missing something? There is no connection for feed water to the hot water heater? That can't be correct.
Follow the blue line.
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Old 05-18-2017, 03:54 PM   #13
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Follow the blue line.
Duh...how did i miss that....
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Old 05-18-2017, 04:24 PM   #14
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I assume that both gray and black tanks need to be vented?

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Yes both tank need to be vented. Above the window/roof line preferably.
The tank needs to breath as the water goes in and as the water goes out.
If you have a 50-gallon tank without a vent then it will only fill up to about 30 gallons because the air trapped in is being compressed which could help for a pressurized dump but you don't get the other 20-gallons of your tank.
On dumping the tank it has to breath to allow the stuff to flow out quicker/easier.
Without a vent it is kind of like the chugging effect when you try to pour milk out of a jug or a big bottle of soda?
I made my vents out 3/4" galvanized pipe and I remove them when going down and install them when needed.
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Old 05-18-2017, 04:25 PM   #15
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Yes both tank need to be vented. Above the window/roof line preferably.
The tank needs to breath as the water goes in and as the water goes out.
If you have a 50-gallon tank without a vent then it will only fill up to about 30 gallons because the air trapped in is being compressed which could help for a pressurized dump but you don't get the other 20-gallons of your tank.
On dumping the tank it has to breath to allow the stuff to flow out quicker/easier.
Without a vent it is kind of like the chugging effect when you try to pour milk out of a jug or a big bottle of soda?
I made my vents out 3/4" galvanized pipe and I remove them when going down and install them when needed.
As with my home plumbing I assume one vent can be attached for both tanks if it is convenient

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Old 05-18-2017, 04:43 PM   #16
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Correct.
Your fresh water tank also needs a vent with a screen that should not be connected to the others and does not have to be ran to the roof line.
For that one. Look at an RV freshwater box design? The ones I have seen have the water fill hookup and the vent right next to each other. Fill it up until water runs out of the vent and your good.
You can use the same connection for city/amp ground water but you need to add a few things.
For me I added check valves and shutoff valves to by pass my freshwater tank and pump if I am hooked up to a supply.
If you are running pex,PVC are any plastic waterline then you will also want a PRV pressure reducing valve close to the connection.
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Old 05-18-2017, 09:14 PM   #17
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I ran my vent line from my black tank up to my RT rear flasher housing using a bulkhead fitting from behind, plan is to put a spacer between the bulb mount and this way one less hole in the roof.
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Old 05-18-2017, 09:18 PM   #18
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Correct.
Your fresh water tank also needs a vent with a screen that should not be connected to the others and does not have to be ran to the roof line.
For that one. Look at an RV freshwater box design? The ones I have seen have the water fill hookup and the vent right next to each other. Fill it up until water runs out of the vent and your good.
You can use the same connection for city/amp ground water but you need to add a few things.
For me I added check valves and shutoff valves to by pass my freshwater tank and pump if I am hooked up to a supply.
If you are running pex,PVC are any plastic waterline then you will also want a PRV pressure reducing valve close to the connection.
Thanks. I appreciate the knowledge.


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Old 05-18-2017, 09:37 PM   #19
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Check out the Hepvo Vent for your sink. It replaces a P-trap and a vent stack in one unit and makes winterizing easier since there's no trap to hold water.
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Old 11-05-2018, 07:31 PM   #20
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I assume that both gray and black tanks need to be vented?

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So, coming from a background of nothing but school, (I’m still a kid), I know that when the wastewater goes in, it will want to push the air somewhere. The water is displacing the air, so a vent is needed to keep a neutral(relative to outdoor air) pressure in the tank. Hope this helps!
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