Our hot tub spa filters meets or exceeds manufacturer specifications.
Filter Specifications:
- Square Footage: 25 sq. ft.
- Media/Thickness: 4
- Diameter: 4-15/16"
- Length: 13-5/16"
- Top: 2-1/8" Hole
- Bottom: 2-1/8" Hole
Equivalent to:
- Pleatco: PRB25-IN-4
- Unicel: C-4625
- Darlly: 42521
- Filbur: FC-2370
- OEM: 17-2325
This Filter Fits The Following Brands:
Pentair, Niagara Whirlpool, Blue Pacific, Hydro Pool
Filter Glossary
As you can see in this graphic, when looking at a filter's threads from the side the difference is very obvious. Standard, sometimes called "MPT" or "Male Pipe" threads are smaller and have a higher number of threads than the S.A.E. style. The S.A.E. threads are large and are square in nature almost resembling a child's toy.
- MPT: Male Pipe Thread
- FPT: Female Pipe Thread
