I bought these for the water bowls in my hermit crab tank and they work well. They were very light in terms of how much air they let out, which is what I bought them for, but I had to tie the air tubes up a bit to slow the flow even more so they didn't splatter. They are very quiet and I only know they work when I look into the pools or raise the pump. I gave this product five stars based on first day of install and experience but I will update if anything changes.
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