Differential Cylinder Pressure Tester Model E2A-12Mm Rotax

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Part# 12-00693
MFR Model# E2A-12MM


The Differential Cylinder Pressure Testers quickly locate worn and cracked rings, defective intake and exhaust valves, scored and cracked cylinders, leaky head gaskets, and worn and stripped spark plug bushings; virtually every potential cause of pressure loss.

Model E2A-12mm Tester, for Rotax engine, that eliminates all guess-work by enabling you to determine the exact location and cause of your engine's efficiency loss.

Our Model E2A-12mm includes:
  • New Slow Fill ValveTM
  • Safely find TDC
  • Safely bleed cylinder test pressure to
    zero for testing multiple cylinders
  • No repeated pressure adjustments
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -


  • Heavy Duty Regulator
  • Heavy Duty Gauges
  • All Connections Quick-Disconnect
  • 12 mm Plug Adapter
  • Extra Long High Pressure Hose
  • Complete instructions with each unit
  • (10/14 mm Adapter Available)
  • Accessories
  • Frequently Purchased With
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This tester worked great!

Michael S
January 20, 2019

Great tool for the job, works well.

May 27, 2018

Worked great. It could however be improved by having a quick connector between the hose and the plug that screws into the spark plug hole. Turning the entire hose with the screw in plug is a hassle to repeat with all 4 cylinders.

Joe R
October 30, 2017


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Regarding the DIFFERENTIAL CYLINDER PRESSURE TESTER MODEL E2A-12MM ROTAX: Could you please tell me what the dimensions of the orifice between gauges are?

This would be for cylinders of less than a 5" bore, .040 orifice diameter, .25" long and 60 degree approach angle.

Q: Will this Differential Cylinder Pressure Tester Model E2A-12mm Rotax work with my Rotax 912ULS?

Yes, this will work with all Rotax engines.

Q: Will this work with a ROTAX 915 Engine?

If the engine has 12mm threaded spark plug holes, it will work.

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