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Old 05-18-2017, 07:59 AM   #11
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Originally Posted by Totallyskooled View Post
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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Originally Posted by Jolly Roger View Post
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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