Spa Filter Baleen: AK-90108, OEM: N/A, Pleatco: PFF50P4 , Unicel: 5CH-45 , Filbur: FC-2401, Diameter: 5-3/16", Length: 12-1/2"

Filter Specifications:

• Square Footage: 45 sq. ft.
• Media/Thickness: 3
• Diameter: 5-3/16"
• Length: 12-1/2"
• Top: 2-1/8" Hole
• Bottom: 2" MPT

Equivalent to:

• Pleatco: PFF50P4
• Unicel: 5CH-45
• Filbur: FC-2401
• OEM:

This Filter Fits The Following Brands:

Freeflow Spas Legend Passport

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