Freshwater tank vent and overflow

[willvalenton]

Do I need separate vent and overflow for my freshwater tank? Thanks.

[JDOnTheGo]

Originally Posted by willvalenton

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).

[bigskypc50]

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.

[Iceni John]

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!

John

[Rusty]

Originally Posted by Iceni John

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?

[chev49]

Originally Posted by willvalenton

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.