The check valve action of the Perma Cap Sewage Treatment Aeration Diffusers makes them ideal for intermittent aeration requirements in sludge digesters, SBR Sewage Treatment Plants and Extended Aeration Sewage Treatment Plants.
3/8" NPT thread Perma Cap diffusers handle up to 15 CFM.
3/4" NPT thread Perma Cap diffusers handle up to 20 CFM.