Piston Ring Compressor 38-83mm by BikeMaster Save Liquid error (snippets/product-badge line 32): Computation results in '-Infinity'% $38.00 SKU BM-152171 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart A mechanic's third hand. The BikeMaster Piston Ring Compressor compresses piston rings for easy piston installations. Includes required hex wrench.