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Finding the right check valves at cheap price was hard https://www.usplastic.com/catalog/item.aspx?itemid=119193&catid=489 clear pvc https://www.ebay.com/itm/Any-Size-Diameter-Clear-PVC-Pipe-1-2-12-Inch-1-5-foot-length/131855689498?var=431203486905&hash=item1eb336271a:m:mkHC3DUhLAgct-hoTr8uEKw...

look at the Pic they are on T. Both vents are normally closed but will open in one direction with a 1/4 #. Tank breaths in and out through the silica. Been on three months and still blue

You can't leave the top side of the gel open or it will collect moisture from the outside. This way the valves keep it closed until 1/4# of pressure in or out. The black tank sits out in the sun all day so it burps, at night when cools it wants air in. Otherwise the warm moist air coming cools...

Here is Pic of a home made tank drier vent, that 2 lbs of silica gel inside that clear 4" pvc. on top are two check valves with a 1/4 lbs open rating. The top and bottom 2" reducers are not glued. Wiggle the unit out take inside remove the top pour crystal on cookie sheet heat in oven at 250...