Quick view Compare Proline® Piston Kit For Echo CS-670 CSG-680 P021002791 Proline® piston kit for Echo CS-670, QV-670, CSG-680 saws. Please match you part with ours for proper fitment; actual pictures shown. This kit is Not made in China. Includes: Piston Piston ring Circlips Wrist pin Specs: 50mm Replaces Echo OEM... $39.95 $27.95 Add to Wishlist Add to Cart