Part# 12-00830
MFR Model# E18MM


Differential cylinder pressure tester plug adapters
California Prop 65 Warning Symbol

WARNING: The product may contain and/or expose you to a chemical(s) or substance(s) which are known to the State of California to cause cancer and/or birth defects or other reproductive harm.


Really no complaints. Shipping preference to AK has always been flat rate priority mail. Item was in stock @ Corona but not Wasilla where I live. After a week and item not in the mail, I called and informed that Origin was indicated AK facility and evidently would be sent to Wasilla and then mailed to me. I indicated mail to me direct from Corona and I had it in 4 days. Was informed that in the future, check mark facility(origin) to be sent from. Evidently the order form had defaulted to Wasilla.

Norm N
May 14, 2021

Works perfect and high quality. Needed 14mm for Carbon Cub SS. Engine does have 18 mm to 14 mm reducers in engine block however, easier just to remove 14 mm spark plug.

Chuck B
May 26, 2019


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: What is the size on the hose side (tool) of the 18mm adapter?

1/8th NPT

Q: What is the size on the hose side (tool) of the 14mm adapter?

1/4 npt.

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