Spa Filter Baleen: AK-40083, OEM: 173601, 817-0016, 303434, Pleatco: PLBS100 , Unicel: C-5397 , Filbur: FC-2972, Diameter: 5-5/16", Length: 17-13/16"

Filter Specifications:

• Square Footage: 80 sq. ft.
• Media/Thickness: 3
• Diameter: 5-5/16"
• Length: 17- 13/16"
• Top: 2-1/8" Hole
• Bottom: 2-1/8" Hole

Equivalent to:

• Pleatco: PLBS100
• Unicel: C-5397
• Filbur: FC-2972
• OEM: 173601, 817- 0016, 303434

This Filter Fits The Following Brands:

Rainbow, Waterway, Leisure Bay, Rec

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