Spa Filter Darlly: 81004 Baleen: AK-70032, OEM: 1039607,73722, Pleatco: PCD100W , Unicel: C-8399 , Filbur: FC-3965, Diameter: 8", Length: 16-1/2"

Filter Specifications:

• Square Footage: 100 sq. ft.
• Media/Thickness: 3
• Diameter: 8"
• Length: 16-1/2"
• Top: Handle
• Bottom: 3-5/8" Hole

Equivalent to:

• Pleatco: PCD100W
• Unicel: C-8399
• Darlly: 81004
• Filbur: FC-3965
• OEM: 1039607, 73722

This Filter Fits The Following Brands:

Caldera Spas

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