Description
Comparison points and tradeoffs
When comparing Seal Kit Compatible Spring fit Cat Pump with other Pump Seals options, use this source-backed detail as the primary discriminator: 31684 Cat Seal Kit 3DNX Pumps. Cat Pumps part 31684 Seal rebuild Kit for CAT Model 3DNX25GSI, 3DNX27GSI, and Rigid 3GXT27 Pumps.
Use this second fact to evaluate the tradeoff: Seal rebuild Kit for CAT Model 3DNX25GSI, 3DNX27GSI, and Rigid 3GXT27 Pumps. A third point to compare across alternatives is: Product identity: Seal Kit Compatible Spring fit Cat Pump.
Alternative-selection boundary
Choose an alternative when its stated identifiers, application, package, or specifications better match the requirement; no unverified competitor claim is introduced here.
Complete source-backed product details
31684 Cat Seal Kit 3DNX Pumps. Cat Pumps part 31684 Seal rebuild Kit for CAT Model 3DNX25GSI, 3DNX27GSI, and Rigid 3GXT27 Pumps.
Source product highlights
About this item
- Cat 31684 Seal Kit
- Seal rebuild Kit for CAT Model 3DNX25GSI, 3DNX27GSI, and Rigid 3GXT27 Pumps.




Roger T. –
Got my cat pump back up and running! The pump was dead in the water. When the old seals failed from being run dry oil had leaked into the pump case and no longer produced pressure. Now it works like new! There are some good YouTube videos that cover replacement.
Wayne –
Way over priced. $119.00 for $10.00 worth of O rings. Doesn’t even have all the O rings to replace everything. For that price it should have all the springs plungers etc.