38 mm replacement plunger with two sticks
| Manufacturer | GPO | 
| Ø outside piston (A) | 37.95 mm | 
| Ø piston pin (B) | 12 mm | 
| Compression height (C) | 22.7 mm | 
| Curvature (D) | 3.3 mm | 
| Total piston height (E) | 55 mm | 
| Number of piston rings (F) | 2 pcs | 
| Nominal diameter | 38 mm | 
| Piston ring mold | Rectangular ring | 
| Piston ring impact | Flank safety device (FS) | 
| Tolerance group | 1 | 
| Weight piston kit | 74 g | 
| Puch | E50 ZA50 (air-cooled) ZA50 (fan-cooled) Z50 (X30 Sport) Z50 (X30 Velux) 2-speed MS, MV, MV50 3-speed VSD, DS, VZ, MC | 
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