Spa Filter Darlly: 40508, Baleen: AK-90091, OEM: 817-4050, Pleatco: PWW50L , Unicel: 4CH-949 , Filbur: FC-0172, Diameter: 4-15/16", Length: 13-1/2"

Filter Specifications:

• Square Footage: 50 sq. ft.
• Media/Thickness: 3
• Diameter: 4-15/16"
• Length: 13-1/2"
• Top: Handle
• Bottom: 2" FEM SAE

Equivalent to:

• Pleatco: PWW50L
• Darlly:  40508
• Unicel: 4CH-949
• Filbur: FC-0172
• OEM: 817-4050

This Filter Fits The Following Brands:

Waterway, Rising Dragon, Sunrise, Hydropool

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