Spa Filter Baleen: AK-40081, OEM: 173600, 817-0015, Pleatco: PLBS75 , Unicel: C-5374 , Filbur: FC-2971, Diameter: 5-5/16", Length: 14-13/16"

Filter Specifications:

• Square Footage: 65 sq. ft.
• Media/Thickness: 3
• Diameter: 5-5/16"
• Length: 14- 13/16"
• Top: 2-1/8" Hole
• Bottom: 2-1/8" Hole

Equivalent to:

• Pleatco: PLBS75
• Unicel: C-5374
• Filbur: FC-2971
• OEM: 173600, 817- 0015

This Filter Fits The Following Brands:

Rainbow, Waterway, Rec Warehouse, Leisure Bay, Cal Spas

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