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Old 08-06-2017, 06:30 AM   #1
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Freshwater tank vent and overflow

Do I need separate vent and overflow for my freshwater tank? Thanks.
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Old 08-06-2017, 07:03 AM   #2
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Originally Posted by willvalenton View Post
Do I need separate vent and overflow for my freshwater tank? Thanks.
Howdy and welcome Will!!

I installed only one which serves as both. The vertical leg (well above the top of the tank) also serves to break the siphon when the tank over-filled (so the overflow doesn't suck out more water than you want it to).
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Old 08-06-2017, 08:35 AM   #3
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On mine I have easy access from outside the coach and I fill straight into the tank so no overfilling. I just got a 1 1/2" PVC threaded plug and screwed it into the tank fitting and then drilled a couple of small holes in the plug with an 1/8" bit.
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Old 08-06-2017, 12:40 PM   #4
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Yes, you do need a vent for the fresh tank, but it doesn't have to be as big as the waste tanks' vents - it just needs to equalize pressure when filling and emptying. I use a 1/2" hose from a 1/2" fitting in the top of each fresh tank, and these hoses come down to ground level. When water begins to squirt out of it, I know that tank is full. Easy!

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Old 08-10-2017, 12:39 AM   #5
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Originally Posted by Iceni John View Post
I use a 1/2" hose from a 1/2" fitting in the top of each fresh tank, and these hoses come down to ground level. When water begins to squirt out of it, I know that tank is full. Easy!

John
Sounds effective, but I would worry about contamination if hose is by the ground acting as a vent?
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Old 08-10-2017, 02:59 AM   #6
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Originally Posted by willvalenton View Post
Do I need separate vent and overflow for my freshwater tank? Thanks.
you can put both on the same vent line with the overflow lower of course. 1/2 to 3/4 plastic is all u need.
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