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Alita makes one of the best air diffusers available anywhere. They are 1.1" in diameter with a rubber bumber on each end and vary in length. Extremely durable and washable (reusable) air diffusing media made with brown Adamantine Spar (corundum/alumina) under ultra high temperature and pressure.
Suitable for koi pond, fish hatchery, aquaculture and aquarium applications.
Fitting size: 1/4" & 1/2" barb, 1/2" MPT, 1" spigot
Optional 3/16 adapter is available.