Product Description
Armstrong Casing Gasket – Part No. 426401-005
Genuine Armstrong replacement casing gasket, Armstrong part number 426401-005, for Series 4380, 4280, 4030, 4300 pumps. Shown as item 101 on the Series 4380 drawing (parts list 6043.129 / 6043.130) – highlighted in the pictures above.
- Also sold as a gasket kit: 8426401-005.
Fits these Armstrong pumps
- Series 4380 (vertical in-line) – pump sizes 3 × 3 × 13, 4 × 4 × 13, 5 × 5 × 13, 5 × 5 × 13H, 6 × 6 × 13, 6 × 6 × 13H, 8 × 8 × 13
- Drawing item: 101
- Series 4280 (close coupled end suction) – pump sizes 3 × 1½ × 13, 3 × 2 × 13, 4 × 3 × 13, 6 × 4 × 13, 6 × 4 × 13H, 6 × 5 × 13, 6 × 5 × 13H, 8 × 6 × 13
- Drawing item: 101
- Series 4030 (base mounted end suction) – pump sizes 3 × 1½ × 13, 3 × 2 × 13, 4 × 3 × 13, 4 × 3 × 13L, 6 × 4 × 13, 6 × 4 × 13H, 6 × 5 × 13, 6 × 5 × 13H, 8 × 6 × 13, 10 × 8 × 13
- Drawing item: 101
- Series 4300 (vertical in-line) – pump sizes 3 × 3 × 13, 4 × 4 × 13, 5 × 5 × 13, 5 × 5 × 13H, 6 × 6 × 13, 6 × 6 × 13H, 8 × 8 × 13, 10 × 10 × 13
- Drawing item: 101
Other parts for this pump
Rebuilding a Series 4380 3 × 3 × 13? These parts are often replaced at the same time:
| Item | Part | Armstrong part no. |
|---|---|---|
| 39 | Water slinger | 419315-000 |
| 40 | Adapter | 426388-011 |
| 40 | Adapter | 426388-031 |
| 40 | Stuffing box / adapter | 426759-011 |
| 40 | Stuffing box / adapter | 426759-031 |
| 40 | Stuffing box / adapter | 426758-011 |
| 40 | Stuffing box / adapter | 426758-031 |
| 43 | Motor washer | 927117-100 |
| 44 | Motor capscrew | 911125-110 |
| 44 | Motor capscrew | 911129-114 |
| 50 | Stuffing box | 426545-011 |
| 50 | Stuffing box | 426545-031 |
| 57 | Male connector | 939001-114 |
| 59 | Flush line tubing | 997531-004 |
| 62 | Mechanical seal kit | 975000-984 |
| 62 | Mechanical seal kit | 9975001-833 |
| 62 | Mechanical seal kit | 9975001-633 |
| 62 | Mechanical seal kit | 9975001-837 |
| 62 | Mechanical seal kit | 9975001-838 |
| 70 | Shaft sleeve | 425869-021 |
| 70 | Shaft sleeve | 425869-003 |
| 71 | Shaft sleeve spacer | 425868-004 |
| 80 | Impeller | 427165-041 |
| 83 | Impeller washer | 425742-003 |
Showing 24 of 32 parts – see the full list in the parts finder.
Not sure this is the right part?
Use our Armstrong Pump Parts Finder: choose Series 4380, your pump size and motor to see every part on the drawing. Or send us your pump’s nameplate details – call (416) 236-2338 or email sales@bramhambros.com. Bramham Bros is an authorized Armstrong dealer.
Product Videos
Custom Field
Brand Armstrong
Armstrong Part Number 426401-005
Part Type Gasket / O-Ring
Fits Series 4380 3 x 3 x 13, 4 x 4 x 13, 5 x 5 x 13, 5 x 5 x 13H, 6 x 6 x 13, 6 x 6 x 13H, 8 x 8 x 13
Fits Series 4280 3 x 1-1/2 x 13, 3 x 2 x 13, 4 x 3 x 13, 6 x 4 x 13, 6 x 4 x 13H, 6 x 5 x 13, 6 x 5 x 13H, 8 x 6 x 13
Fits Series 4030 3 x 1-1/2 x 13, 3 x 2 x 13, 4 x 3 x 13, 4 x 3 x 13L, 6 x 4 x 13, 6 x 4 x 13H, 6 x 5 x 13, 6 x 5 x 13H, 8 x 6 x 13, 10 x 8 x 13
Fits Series 4300 3 x 3 x 13, 4 x 4 x 13, 5 x 5 x 13, 5 x 5 x 13H, 6 x 6 x 13, 6 x 6 x 13H, 8 x 8 x 13, 10 x 10 x 13
Drawing Item 4030: item 101; 4280: item 101; 4300: item 101; 4380: item 101
Shipping cost: Inquire
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