Feels like quality construction, it doesn't noticably inhibit air flow and they do stop water from siphoning out. I air leak tested 3 of these I am currently using in different conditions for the sake of leaving a review with some data. One had no air leaks, one had a barely detectible air leak, and one had a very noticable air leak. Ultimately the leaks were small and effectively this made no difference in my setups so I won't be looking to replace them and would buy again.
This is the best check valve I've ever used! Aquarium co-op is awesome!
I’m always looking for a better check valve that doesn’t severely restrict airflow. This is one of the better check valves I’ve come across in that regard.
Purchased with a sponge filter, item seems to be doing its job perfectly.
dont need them right now but like to have just in case
Super fast shipping! Everything works! Thanks!
Work as they are expected to. Not using them is acting for disaster.
ive ordered twice from aquarium coop and both times have been very speedy and very well priced. keep up the good work
Works great! Great price and Great Service
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