Spa Filter Baleen: AK-3025, OEM: N/A, Pleatco: PCP20-4 , Unicel: C-4403 , Filbur: FC-3073, Diameter: 4-5/8", Length: 11-5/8"

Filter Specifications:

• Square Footage: 25 sq. ft.
• Media/Thickness: 3
• Diameter: 4-5/8"
• Length: 11-5/8"
• Top: Handle
• Bottom: 1-3/8" Hole

Equivalent to:

• Pleatco: PCP20-4
• Unicel: C-4403
• Filbur: FC-3073
• OEM:

This Filter Fits The Following Brands:

Nemco

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