NATIONAL JWS165/340 Pump parts list
| Liners & Liner Packing | 
| SIZES | LINER | LINER PACKING | 
| 3” | MK-0240-30 | MK-1712064 | 
| 3½” | MK-0240-34 | MK-1712064 | 
| 4” | MK-0240-40 | MK-1712064 | 
| 4½” | MK-0240-44 | MK-1712064 | 
 
| Gaskets | 
  | 
| JWS165 | MK-2410031-429 | 
| JWS340 | MK-1718265 | 
 
 
| SERIES | KING – G2 | KING – G2 | 
  | SUCTION | DISCHARGE | 
| VALVE (Urethane Insert) | MK-1561575 | MK-1561575 | 
| VALVE (Rubber Insert) | N/A | N/A | 
| VALVE SEAT | MK-1561571 | MK-1561572 | 
| VALVE SPRING | MK-1712211 | MK-1712206 | 
| VALVE INSERT (Urethane) | MK-1561577 | MK-1561577 | 
| VALVE INSERT (Red Thunder) | N/A | N/A | 
| VALVE INSERT (Rubber) | N/A | N/A | 
| VALVE SEAT PULLER HEAD | N/A | N/A | 
 
| Piston Size | Red Thunder Bonded Pistons | Imperial Piston | Imperial Rubber Kits | Rubber Bonded | Long Life (Urethane) | 
| 3” | N/A | MK-I30HK10 | MK-I30HK | N/A | N/A | 
| 3½” | N/A | MK-I34HK10 | MK-I34HK | N/A | N/A | 
| 4” | MK-RT-400 | MK-I40HK10 | MK-I40HB | MK-RB-400-10 | MK-LL-400-10 | 
| 4½” | MK-RT-440 | MK-I44HK10 | MK-I44HB | MK-RB-440-10 | MK-LL-440-10 | 
* ¼ Size are available upon request
 
| RODS | 
  | PISTON ROD | SUB ROD | EXTENSION ROD | ROD CLAMP | PISTON ROD NUT | 
| ONE PIECE | MK-0238 | 
  | MK-16-0238 | MK-24-0238 | MK-7403224 | 
| TWO PIECE | MK-0238-A | MK-0238-B | MK-16-0238 | MK-24-0238 | MK-7403224 |