Pleatco Cartridge [30 Sq Ft Coreless 3-3/8" T 4-1/2" B 8" 6-1/4" L 3oz] (PBF40) maytronics and this Perma Cast version

and this Perma Cast version is a brass cast design using the PE-8 reference

A diffuser is useful because it works directly with the impeller to manage internal water flow and helps the wet end operate with the balance and efficiency it was designed to have

Match by part number

Supports secure attachment and easier cleanout

Useful for ongoing use or higher-volume stocking needs

Pleatco Cartridge [30 Sq Ft Coreless 3-3/8" T 4-1/2" B 8" 6-1/4" L 3oz] (PBF40) maytronics and this Perma Cast versionPleatco Cartridge [30 Sq Ft Coreless 3 3 8" T 4 1 2" B 8" 6 1 4" L 3oz] from Pleatco Filters is a practical replacement component for pool and spa service work where the correct fit, material, and part configuration matter. This part is intended to help restore dependable equipment operation while keeping repairs focused and efficient. Use the listed part number, PBF40, along with the product dimensions and system requirements to confirm compatibility