Airtight gasket for pneumatic tool

An airtight gasket for a pneumatic tool including an airflow regulation portion, an air intake passage to direct high pressure air to enter the airflow regulation portion and a pneumatic motor to receive the high pressure air from the airflow regulation portion to spin, the airflow regulation portion including a regulation valve, the airtight gasket being clamped between the regulation valve and the air intake passage, the regulation valve including a flow directing vent opened and corresponding to the air intake passage to receive the high pressure air and a recess surrounding the flow directing vent, the airtight gasket comprising:

• a base located in the recess of the regulation valve;
• a through-hole formed on the base and communicated with the air intake passage and the flow directing vent to receive the high pressure air;
• and
• an airtight convex ring surrounded the through-hole and extended integrally from the base towards the air intake passage.