Originally Posted by cindy
I've replaced my old metal tank with a new polyethelene one. I need to put in an air vent and have a threaded opening for it.
My question is
How can I finish it on the outside so that its exterior opening looks good.
I am assuming you are talking about your fresh water tank?
If so, there is no need to vent it to the outside, as there should not be an odor or gas problem. You can vent the fresh tank with a hose that terminates above the tank and higher than the filler tube by a few inches. you can use rigid PVC pipe, if you have room, or flexible tubing, if you need to hide it behind installations, or a combination thereof.
The tank vent will prevent burps when filling, and provide smooth draining. It also keeps the tank from forming a vacuum, thus allowing water delivery to the pump when the faucets are on.
You might add a small screen type material to the end of the hose, like very fine mesh screen material to keep the occasional bug or piece of dirt out of the vent tube.