Spa Filter Darlly: 81254 Baleen: AK-70021, OEM: 6540-490, Pleatco: PSD125U , Unicel: C-8325 , Filbur: FC-2790, Diameter: 8-7/16", Length: 18"

Filter Specifications:

• Square Footage: 125 sq. ft.
• Media/Thickness: 3
• Diameter: 8-7/16"
• Length: 18"
• Top: Closed w/ 3 step
• Bottom: 2-1/2" Hole

Equivalent to:

• Pleatco: PSD125U
• Unicel: C-8325
• Filbur: FC-2790
• OEM: 6540-490
• Darlly: 81254

This Filter Fits The Following Brands:

Sundance Universal

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