Spa Filter Baleen: AK-6028, OEM: 07-0658,R173310, Pleatco: PPF40 , Unicel: C-7440 , Filbur: FC-2130, Diameter: 7", Length: 11-1/8"

Filter Specifications:

• Square Footage: 40 sq. ft.
• Media/Thickness: 4
• Diameter: 7"
• Length: 11-1/8"
• Top: 2-15/16" Hole
• Bottom: 2-15/16" Hole

Equivalent to:

• Pleatco: PPF40
• Unicel: C-7440
• Filbur: FC-2130
• OEM: 07-0658,R173310

This Filter Fits The Following Brands:

Pentair Purex CF-40

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