Spa Filter Darlly: 40505 Baleen: AK-3026, OEM: 17-2464, 817-5010, Pleatco: PRB25SF-PAIR , Unicel: C-4405 , Filbur: FC-2387, Diameter: 4-15/16", Length: 6-5/8"

Filter Specifications:

• Square Footage: 50 sq. ft.
• Media/Thickness: 3
• Diameter: 4-15/16"
• Length: 6-5/8"
• Top: 2-1/8" Hole
• Bottom: 2-1/8" Hole

Equivalent to:

• Pleatco: PRB25SF-PAIR
• Unicel: C-4405
• Filbur: FC-2387
• OEM: 17-2464, 817-5010
• Darlly: 40505

This Filter Fits The Following Brands:

Rainbow DSF-50, Pentair, Lifestyle, Waterway, Beachcomber, Catalina,

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