Spa Filter Baleen: AK-6053, OEM: 172877, R173316, Pleatco: PFAB75-4 , Unicel: C-7491 , Filbur: FC-2190, Diameter: 7", Length: 18-7/16"

Filter Specifications:

• Square Footage: 75 sq. ft.
• Media/Thickness: 4
• Diameter: 7"
• Length: 18-7/16"
• Top: 2-5/8" Hole
• Bottom: 2-5/8" Hole

Equivalent to:

• Pleatco: PFAB75-4
• Unicel: C-7491
• Filbur: FC-2190
• OEM: 172877, R173316

This Filter Fits The Following Brands:

Pentair Pac-Fab Seahorse FSH-300

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