Spa Filter Baleen: AK-5024, OEM: 312-1003, Pleatco: PD60-4 , Unicel: C-6659 , Filbur: FC-4002, Diameter: 6-15/16", Length: 22-3/8"

Filter Specifications:

• Square Footage: 60 sq. ft.
• Media/Thickness: 4
• Diameter: 6-15/16"
• Length: 22-3/8"
• Top: Closed w/string
• Bottom: 2-1/16" Hole

Equivalent to:

• Pleatco: PD60-4
• Unicel: C-6659
• Filbur: FC-4002
• OEM: 312-1003

This Filter Fits The Following Brands:

Doughboy (original)

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