| Item | Part No. | Part Name | Qty | Serial No. |
| 1 | 421-64-15501 | BY-PASS VALVE | ||
| 1A | HOUSING | |||
| 2 | SPOOL | |||
| 3 | 421-64-15530 | POPPET | ||
| 4 | 421-64-15540 | COMPRESSION SPRING | ||
| 5 | 421-64-15550 | O-RING | ||
| 6 | 421-64-15560 | COVER | ||
| 7 | 421-64-15570 | SPRING | ||
| 8 | 421-64-15580 | O-RING | ||
| 9 | 421-64-15590 | PLUG | ||
| 10 | 421-64-15910 | CAP | ||
| 11 | 421-64-15920 | SEAL | ||
| 12 | 421-64-15930 | STRIPPER | ||
| 13 | 421-64-15940 | COVER | ||
| 14 | 421-64-15950 | SCREW |