Package Includes: 500866 Piston Bumper x 1, 402011 Seal Sleeve x 1, 500407 Main Value Spring x 1, 501001 Cap Gasket x 1, O Ring Kit x 1 Part Number: 500866 501001 402011 500407. Suitable for F350S F250S F325C Framing Nailer These parts install quickly to make your Framing nailer work like new again. Return refund: If you have any questions, you can refund in full without any problems A brand-new, unused, unopened, undamaged item in its original packaging.