Proform Universal Piston Ring Filers
- Proform universal piston ring filers come with everything you need to gap your piston rings properly. To ensure proper piston ring end-gap, these piston ring filers enable the user to file piston rings quickly and accurately. Position the piston ring firmly against the dowel pins, and then turn the handle to rotate the abrasive wheel. Using a feeler gauge, file the piston rings to meet the manufacturer's specifications.