Overview Reviews Product Description The Lisle spring clutch assures a proper fit on the piston and a positive locking action. Lisle Tools Catalog Product Videos Custom Field Harmonization code HTS #8205701000 Manufacturing country US Product Reviews Write a Review Write a Review × Lisle 3-1/2 - 7" Piston Ring Compressor Tool 21000 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *