Spa Filter Darlly: 40051, Baleen: AK-3039, OEM: 58600, 59900, F18, Pleatco: PC7-120 , Unicel: C-4607 , Filbur: FC-3710, Diameter: 4-1/4", Length: 8"

Filter Specifications:

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

Equivalent to:

• Pleatco: PC7-120
• Darlly: 40051
• Unicel: C-4607
• Filbur: FC-3710
• OEM: 58600, 59900, F18

This Filter Fits The Following Brands:

Krystal Klear, Best Way

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