A cylindrical metal member that guides the piston to linearly reciprocate in the cylinder. Air converts thermal energy into mechanical energy by expansion in the engine cylinders; the gas is compressed by the piston in the compressor cylinder to increase the pressure.

3" Empty cylinder 3"QG-00-00
No	figure number	Name
1	GB91-76 4×20	Cotter pin
2	3"QG-00-07	Pin
3	3"QG-00-07	Connection fork
4	GB51-76 M12	Hex nuts
5	GB1235-76 20×2.4	O-ring
6	3"QG-00-04	Copper sets
7	GB51-76 M10	Hex nuts
8	GB93-76 M10	Spring washer
9	GB273-66	Oil Cup
10	3"QG-00-05	Upper cover
11	3"QG-00-03	Paper Pad
12	3"QG-01-02A	Piston rod
13	GB3452.1-82 9×1.8	O-ring
14	3"QG-01-01A	piston
15	3"QG-00-10	Guide ring
16	GB3452.1-82.67×3.55	O-ring
17	GB93-76 10	Spring washer
18	GB6176-86 M10	Hex nuts
19	3"QG-00-02	Cylinder
20	3"QG-00-01A	lower lid
21	GB21-76 M10×120	Hex head bolt

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