This Pleatco PFF25P4 hot tub filter is a compatible replacement for the OEM FF-150 used in select Free Flow spas which have an open top with threads on the bottom. Also a compatible replacement for the Unicel brand 4CH-22, Master Deluxe M40257 and Filbur FC-2399
Top View
- Outside Diameter 4-5/8″ (117mm)
- Top Hole 2-1/8″ (54mm)
Side View
- Filter Length 6-5/8″ (168mm)
- Washable Pleats
Bottom View
- Male MPT Threads Referenced as 1-1/2″ (38mm)
- Actual Outside Diameter of Threads 1-13/16″ (47mm)
Compatible replacement for:
- Unicel 4CH-22
- Master Deluxe M40257
- Filbur FC-2399
