6″ Alita Cylinder Air Diffuser w/ rubber bumpersThese diffusers have a molded rubber support on each end that protects the diffuser from abrasives.Extremely durable and washable (reusable) air diffusing media. Manufactured with brown Adamantine Spar (corundum/alumina) under ultra high tempeature and pressure. Applicable in Acidic or Alkaline waters (low or high pH) Suitable for aquarium, koi pond, fish hatchery and aquaculture applications. Fittings:Barb:1/4″ / 1/2″1/2″ MPT1″ Spigot (fits 1″ PVC fittings)Diffuser Diameter:1.2″Available Sizes: 6″, 9, 12″6″ Alita Cylinder Air Diffuser w/ rubber bumpersThese diffusers have a molded rubber support on each end that protects the diffuser from abrasives.Extremely durable and washable (reusable) air diffusing media. Manufactured with brown Adamantine Spar (corundum/alumina) under ultra high tempeature and pressure. Applicable in Acidic or Alkaline waters (low or high pH) Suitable for aquarium, koi pond, fish hatchery and aquaculture applications. Fittings:Barb:1/4″ / 1/2″1/2″ MPT1″ Spigot (fits 1″ PVC fittings)Diffuser Diameter:1.2″Available Sizes: 6″, 9, 12″Product code: 4693Item No. AE-AL-106C