Spa Filter Baleen: AK-4026, OEM: 174821, Pleatco: N/A , Unicel: C-5623 , Filbur: FC-1910, Diameter: 5-5/16", Length: 13-9/16"

Filter Specifications:

• Square Footage: 23 sq. ft.
• Media/Thickness: 4
• Diameter: 5-5/16"
• Length: 13-9/16"
• Top: 2" Hole w/loop
• Bottom: 2" Hole

Equivalent to:

• Pleatco: N/A
• Unicel: C-5623
• Filbur: FC-1910
• OEM: 174821

This Filter Fits The Following Brands:

Pentair-Pac Fab, Pac Fab Mytilus

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