Our hot tub spa filters meets or exceeds manufacturer specifications.
Sta-Rite Posi-Flo II PTM137 T-137TX T-137TXR
Filter Specifications:
- Square Footage:
- Media/Thickness: 4
- Diameter: 8-11/16"
- Length: 31-1/4"
- Top: 4-3/16" Hole
- Bottom: 4-3/16" Hole w/ concentric
Equivalent to:
- Pleatco: PSR137-4
- Unicel: UHD- SR137
- Filbur: FC-2570
- OEM: WC108-70S2x
- Darlly: 81371
This Filter Fits The Following Brands:
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
