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Coarse Bubble Aeration


Greater unit capacity over other small-diameter diaphragm coarse bubble diffusers at less cost.

  EDI PermaCap™ diffusers are ideal for aeration applications where intermittent coarse bubble operation is desired. PermaCap units are available with either 3/8-inch or ¾-inch NPT threaded (male) inlet to allow quick and simple installation into threaded pipe applications. Optional UDM (Universal Diffuser Mount) is available for non-threaded applications. Units are particularly well suited for single drop pipe installations in package treatment plants and channel aeration.

 The diffuser assembly features a flexible membrane element that is configured to exclude solids during idle operations providing long-term trouble-free operation. This membrane includes a non-perforated area that is directly aligned with the air outlet port. During idle operation the membrane retracts and seals the air exit port, reducing back flow into the unit. The membrane element is mechanically engaged with the diffuser assembly preventing the membrane from disengaging from the diffuser assembly.

The PermaCap is suitable for installation on bottom (preferred) of diffuser piping. PermaCap coarse bubble units offer great value as a low-cost aeration/mixing solution.


•  Threaded 3/8-inch or ¾-inch design NPT connection
•  Low capital and maintenance cost
•  5-inch (127mm) or 3-inch (79mm) diameter
•  Durable ABS body with diaphragm check valve
•  Available for top or bottom mounting

MaxAir SS

PermaCap Coarse Bubble Diffuser