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A seal member for a pneumatic tool is a flexible ring mounted to a ring-shaped cylinder in which a rotary piston is rotatably engaged. The cylinder has an inlet and an outlet radially defined therethrough. Two pairs of ribs respectively extend radially outward from the cylinder and the first inlet i

A seal member for a pneumatic tool is a flexible ring mounted to a ring-shaped cylinder in which a rotary piston is rotatably engaged. The cylinder has an inlet and an outlet radially defined therethrough. Two pairs of ribs respectively extend radially outward from the cylinder and the first inlet is located between one of the two pairs of ribs and the outlet inlet is located between the other pair of the two ribs. The seal member has a first hole communicating with the inlet and a second hole communicating with the outlet. The first hole is enclosed by a first flange and the second hole is enclosed by a second flange. One pair of the ribs is engaged with and enclosed by the first flanges the other pair of ribs is engaged with and enclosed by the second flange.

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1. A combination of a seal member and a cylinder for a pneumatic tool comprising:a cylinder being a ring-shaped member and a rotary piston rotatably engaged with an inside of said cylinder, an inlet and an outlet radially defined through said cylinder, two first ribs respectively extending radially

1. A combination of a seal member and a cylinder for a pneumatic tool comprising:a cylinder being a ring-shaped member and a rotary piston rotatably engaged with an inside of said cylinder, an inlet and an outlet radially defined through said cylinder, two first ribs respectively extending radially outward from said cylinder and said first inlet located between said two first ribs, two second ribs respectively extending radially outward from said cylinder and said outlet inlet located between said two second ribs, and a seal member mounted to an outside of said cylinder, a first hole and a second hole respectively defined through said seal member, a first flange extending radially outward from said seal member and said first hole enclosed by said first flange, a second flange extending radially outward from said seal member and said second hole enclosed by said second flange, said first inlet communicating with said first hole and said second inlet communicating with said second hole, said first ribs engaged with and enclosed by said first flange, said second ribs engaged with and enclosed by said second flange.