I searched and searched for check valves that fit the 1/4 inch air line and tried a few but found they were a millimeter smaller and not tight in the line. I bought these to use on a standard aquarium air pump and they really fit perfectly and work really well. My pump is in the basement and has a 1/4 inch air line that runs through my floor and the warm air from the pump going through the air line in the air conditioned bedroom causes condensation to flow back to the pump. I didn't want it to ruin the pump and I always had to run down the stairs and empty the pit from time to time which is hard for me as someone who can't go up and down stairs. This check valve solved this problem perfectly and I am so thankful! Thanks for a great product!
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