Spa Filter Darlly: 60251, Baleen: AK-9011, OEM: 90-802, Pleatco: PTL20W-SV-P4-4 , Unicel: 6CH-25 , Filbur: FC-0305, Diameter: 6", Length: 5-1/2"

Filter Specifications:

• Square Footage: 25 sq. ft.
• Media/Thickness: 3
• Diameter: 6"
• Length: 5-1/2"
• Top: Handle
• Bottom: 1-1/2" MPT

Equivalent to:

• Pleatco: PTL20W-SV- P4-4
• Unicel: 6CH-25
• Filbur: FC-0305
• OEM: 90-802
• Darlly: 60251

This Filter Fits The Following Brands:

Softub

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