This sturdy 7″ Air Diffuser has a 1/4″ brass NPT fitting with a heavy base bottom plate. The high quality epoxy of this air diffuser will not blow off giving you years of service. Normal flow for this air stone is 1.5 CFM.
This durable diffuser is made from compressed silica sand. It will handle up to about 3.5 CFM When used for winter de-icing the air stone will give maximum water turnover for ice reduction.