Venting a small closed gravity feed system

[T-Bone]

Hi,

I am making a small closed gravity feed system to supply a utility sink.
I have a 55 gallon plastic drum with 2 bung closures.
The plan is to mount the tank on its side. The lower bung will have a spigot that runs the supply line to the sink. The upper bung will have a length of garden hose running down with a quick connect fitting. I will use this to refill the tank from a garden hose. This will allow me to fill the tank without having to get out a ladder as the tank will be 6ft or so above the ground.
I know that I need some sort of air inlet to let air out of the tank as it fills and into the tank as it drains.
I want something that will not allows insects into the tank. I found micromembrane vents that can be inserted in the 3/4 knock out on a drum bung. I am wondering if I could use one of these in a 3/4 hole on the side of the tank that faces up?
what other options would you suggest ?
Thanks for your help!

 

[Valveman]

Probably going to need an overflow as well. Here is an overflow with screened vent I found.
https://www.draytontank.co.uk/Tank-overflow-kits-fitting-mesh-rodent-screen.htm

 

[Sponsor]

 

[T-Bone]

If I were to use a pipe with a mesh screen wouldn't that also serve as an overflow ?
This water is not for drinking.
I doubt that it will ever have more than 30 or so gallons in it at any time.
It will be easy to fill as needed and the usage will be minimal.

 

[Valveman]

Sure. Usually best to use a couple elbows and have the screen pointing down.