7" air diffuser with 3/8" brass fitting /check valve
This sturdy diffuser has a heavy base that will give you years of service. Normal flow is 1.5 cfm. less is better as the bubbles are smaller and you get better oxygen transfer. This diffuser has a 3/8" threaded fitting and is used on the windmills or winter systems to hold the air down at the air diffuser on the bottom of the pond to stop line freeze up.
Pond Perfections inc. Catalog