Company23 Subaru EJ20 Piston Ring Compressor



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  • Gradual billet taper design precisely guides the piston into the bore.  Will not damage piston or rings.
  • Adjustable diameter allows one tool to work on all stock and oversize pistons/bores of a particular engine.
  • Convenient tool-less thumb adjuster makes adjustments easy.
  • CNC machined from tempered and anodized aerospace grade alloy.
Works with:
  • Fits engine bores from 90.17mm-93.98mm (3.55″-3.70″)
  • Perfect for EJ20 engines (fits all stock and oversize pistons/bores)
  • Comparable to factory tool #398744300
Weight0.3 kg
Dimensions11 × 11 × 5.00 cm


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