Spa Filter Darlly: 40352, Baleen: AK-3023, OEM: 17-2606, 817-3510, Pleatco: PRB17.5SF-PAIR , Unicel: C-4401 , Filbur: FC-2386, Diameter: 4-15/16", Length: 4-5/8"

Filter Specifications:

• Square Footage: 35 sq. ft.
• Media/Thickness: 3
• Diameter: 4-15/16"
• Length: 4-5/8"
• Top: 2-1/8" Hole
• Bottom: 2-1/8" Hole

Equivalent to:

• Pleatco: PRB17.5SF- PAIR
• Unicel: C-4401
• Filbur: FC-2386
• OEM: 6000-134, 17-2606, 817- 3510
• Darlly: 40352

This Filter Fits The Following Brands:

Rainbow DSF-35, Waterway, Lifestyle, Sundance

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