Spa Filter Baleen: AK-8023, OEM: 111831, 817-0075, Pleatco: PWW75-4 , Unicel: C-9401 , Filbur: FC-2960, Diameter: 9-15/16", Length: 13-5/16"

Filter Specifications:

• Square Footage: 75 sq. ft.
• Media/Thickness: 4
• Diameter: 9-15/16"
• Length: 13-5/16"
• Top: 5-3/16" Hole
• Bottom: 6-1/16" Hole

Equivalent to:

• Pleatco: PWW75-4
• Unicel: C-9401
• Filbur: FC-2960
• OEM: 111831, 817- 0075

This Filter Fits The Following Brands:

Rec Warehouse, Waterway

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

How to measure a hot tub filter references:

Spa Care Center or Pool Care Center