WABCO part numbers starting 554
| 554107 | Piston LP 0.010 o/s | WABCO | ||
| 554108 | LP piston with wrist pin 0.020 in o/s | WABCO | ||
| 554109 | LP piston with wrist pin 0.030 in o/s | WABCO | ||
| 554110 | LP piston with wrist pin 0.040 in o/s | WABCO | ||
| 554951 | Valve, supply cage (valve, automatic brake) | WABCO | ||
| 554952 | Housing (valve, automatic brake) | WABCO | ||
| 554953 | Stem, diaphragm (valve, automatic brake) | WABCO | ||
| 554995 | Supply valve complete | WABCO |