Aftermarket Parts


FlexAir Disc Membrane – EDI®
The FlexAir™ disc diffuser is a fine pore flexible membrane or ceramic media diffuser that provides operational flexibility with maximum oxygen transfer efficiency. For ease of installation and maintenance, EDI's disc diffusers offer two connection methods: threaded and integrated saddle mount. The threaded disc diffuser can be installed in any 3/4-inch fitting or pipe nipple. Pipe with wall thickness equal to or greater than SCH40 can be drilled and tapped for connecting the diffuser. Additionally, diffusers can be installed using UDM (see "Specialty Disc Diffuser Items") when using thinner wall pipe for air distribution. The 9-inch diameter diffuser is also available with EDI’s innovative Integral Saddle Mount, which provides unmatched mechanical strength. Disc diffusers are constructed of glass-filled polypropylene and suitable for deep tank (high-temperature) applications. Alternate materials of constructions are available for special applications. FlexAir disc diffuser units are available with premium quality EPDM membranes. Multiple perforation patterns are available to optimize system performance. The flexible membrane diffusers incorporate a triple-check valve design to prevent intrusion of liquid or solids into the diffuser or air piping under normal on/off operating conditions.

Related Products

Stainless Steel Clamps for Tube Membranes

304 SS Standard with 316 SS available, Special Order
304 SS clamps are typically stock items.
316 SS clamps stocked in some sizes.
Non-stocked sizes may have 4–6 week lead time.

MaxAir SS CoarseAir Coarse Bubble Diffuser

Heavy duty 316 SS construction
3/4″ male NPT nipple for connection
Cast inlet and end cap
Continuous welded construction
Open bottom or closed bottom (with deflector) options

PermaCap Coarse Bubble Diffuser

Base and ring are constructed of ABS.
Base unit connection is 3/4″ or 3/8″ male NPT.
Standard diffuser membranes are EPDM.
Larger 5″ diameter for maximum air distribution

Spectrum Ceramic Saddle Diffuser

Base and ring are constructed of glass-filled polypropylene. Spectrum™ Saddle Mount withstands 200-pound edge load without failure with KlicLoc™ retainer for positive mechanical mount. Standard diffuser media is aluminum oxide. Available saddle sizes: 3″, 4″, 90mm, 110mm diameter pipe. Ceramic and membrane media options are interchangeable.

Integral Saddle Mounted Disc Diffuser

Exclusively available for 9” and 12” diameter discs
Glass fiber-reinforced polypropylene construction for maximum chemical, temperature, and UV resistance
Advanced technology premium-quality membrane materials available in EPDM and other special polymer blends
Triple-check valve design prevents entry of liquid/solids into piping. Ideal for on/off applications
Resistant to fouling and plugging for low maintenance
Integral Saddle Mount provides ease of installation and maintenance
High-capacity membrane option available for maximum airflow
and low operating pressure


3 times stronger than conventional mounting or push-on systems
Pre-assembled and leak tested in our facilities
Patented KlicLoc™ retainer for positive mechanical lock