NATIONAL Mud pump 7-P-50 fluid end parts list
| Item | Part No. | Description | Qty per Pump |
| 1 | MK-1294150 | Discharge Module, Studded (Included Items 2 – 7) | (3) |
| 2 | MK-1294151 | Discharge Module, Only | 3 |
| 3 | MK-6300160 | Nut – Wedge Adjusting | 24 |
| 4 | MK-2408042 | Stud w/Nut – Frame | 24 |
| 5 | MK-2408043 | Stud w/Nut – Liner Bushing | 18 |
| 7 | MK-2408041 | Stud w/Nut – Discharge to Suction | 18 |
| 9 | MK-1294156 | Suction Module | 3 |
| 10 | MK-1294165 | Bushing – Liner | 3 |
| 11 | MK-1294174 | Seal Retainer | 6 |
| 12 | MK-1294172 | Valve Cover | 6 |
| 13 | MK-1290178 | Screw – Wedge Adjusting | 6 |
| 15 | MK-1290315 | Washer – Wedge Adjusting | 6 |
| 16 | MK-1290181 | Spring – Wedge Assembly | 6 |
| 17 | MK-1290376 | Wedge Assembly | 6 |
| 18 | MK-1540126 | Gasket – Valve Cover | 6 |
| 19 | MK-1292140 | Holder – Valve Guide | 6 |
| 20 | MK-1292141 | Insert – Valve Guide | 6 |
| 21 | MK-6511416 | Pin, Vs” × 2″ Dowell | 6 |
| 22 | MK-1294160 | 1Plate – Wear | 3 |
| 23 | MK-1294170 | Connector – Discharge | 2 |
| 24 | MK-7000305-10 | Screw, ½” × 1½” Hex Head | 16 |
| 25 | MK-7602050 | Washer, Spring Lock | 16 |
| 26 | MK-1294171 | Adapter – Discharge Connector | 2 |
| 27 | MK-2410031-348 | Packing, Rectangular | 2 |
| 28 | MK-2410031-427 | Packing, Rectangular | 4 |
| 29 | MK-1294166 | Clamp – Liner | 3 |
| 34 | MK-2402560 | Stud, 1¼” × 6¼” | 16 |
| 35 | MK-6300200 | Nut 1¼” Hvy. Hex | 16 |
| 41 | MK-1 540142 | Seal – Suction Manifold | 3 |
| 42 | MK-1294168 | Collar – Liner | 3 |
| 43 | MK-1294192 | Seal – Module, Wear Plate | 6 |
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