Spa Filter Baleen: AK-4008, OEM: 27-056, Pleatco: PPR75 , Unicel: C-5371 , Filbur: FC-2018, Diameter: 5-3/16", Length: 23-1/4"

Filter Specifications:

• Square Footage: 75 sq. ft.
• Media/Thickness: 3
• Diameter: 5-3/16"
• Length: 23-1/4"
• Top: 1-5/8" Hole
• Bottom: 1-5/8" Hole

Equivalent to:

• Pleatco: PPR75
• Unicel: C-5371
• Filbur: FC-2018
• OEM: 27-056

This Filter Fits The Following Brands:

Premier Springwater Hercules Maxi- Sweep

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