Spa Filter Darlly: 50371 Baleen: AK-4031, OEM: 42-3533-00-R, Pleatco: PJ37-IN-4 , Unicel: C-5635 , Filbur: FC-1437, Diameter: 5", Length: 13-5/16"

Filter Specifications:

• Square Footage: 37 sq. ft.
• Media/Thickness: 4
• Diameter: 5"
• Length: 13-5/16"
• Top: 2-3/8" Hole
• Bottom: 2-3/8" Hole

Equivalent to:

• Pleatco: PJ37-IN-4
• Unicel: C-5635
• Filbur: FC-1437
• Darlly: 50371
• OEM: 42-3533-00-R

This Filter Fits The Following Brands:

Jacuzzi Bros. CFR-37, Competition Pool, Cantar, Atlantic Pool, Morgan

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