Product Description
Armstrong Casing Gasket – Part No. 426401-002
Genuine Armstrong replacement casing gasket, Armstrong part number 426401-002, for Series 4380, 4280, 4280-50, 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: 8426401-002.
Fits these Armstrong pumps
- Series 4380 (vertical in-line) – pump sizes 1½ × 1½ × 6, 2 × 2 × 6, 3 × 3 × 6, 4 × 4 × 6W
- Drawing item: 101
- Series 4280 (close coupled end suction) – pump sizes 1½ × 1 × 6, 3 × 1½ × 6, 3 × 2 × 6, 3 × 2½ × 6, 4 × 3 × 6W
- Drawing item: 101
- Series 4280-50 (pool & spa (NSF-50)) – pump sizes 1½ × 1 × 6, 3 × 1½ × 6, 3 × 2 × 6, 3 × 2½ × 6, 4 × 3 × 6
- Drawing item: 101
- Series 4030 (base mounted end suction) – pump sizes 1½ × 1 × 6, 3 × 1½ × 6, 3 × 2 × 6, 3 × 2½ × 6, 4 × 3 × 6, 6 × 6 × 6
- Drawing item: 101
- Series 4300 (vertical in-line) – pump sizes 1½ × 1½ × 6, 2 × 2 × 6, 3 × 3 × 6, 4 × 4 × 6
- Drawing item: 101
Other parts for this pump
Rebuilding a Series 4380 1½ × 1½ × 6? These parts are often replaced at the same time:
| Item | Part | Armstrong part no. |
|---|---|---|
| 15 | Set screw | 916517-005 |
| 16 | Set screw | 916519-104 |
| 17 | Set screw | 916517-205 |
| 21 | Shaft extension | 426992-071 |
| 36 | Shaft key | 974515-400 |
| 39 | Water slinger | 406622-000 |
| 40 | Stuffing box / adapter | 426746-011 |
| 40 | Stuffing box / adapter | 426746-031 |
| 40 | Stuffing box / adapter | 426747-011 |
| 40 | Stuffing box / adapter | 426747-031 |
| 43 | Motor washer | 927113-100 |
| 44 | Motor capscrew | 911121-108 |
| 44 | Motor capscrew | 911125-108 |
| 57 | Male connector | 939001-114 |
| 59 | Flush line tubing | 997531-004 |
| 62 | Mechanical seal kit | 975000-982 |
| 62 | Mechanical seal kit | 9975001-813 |
| 62 | Mechanical seal kit | 9975001-613 |
| 62 | Mechanical seal kit | 9975001-817 |
| 62 | Mechanical seal kit | 9975001-818 |
| 70 | Shaft sleeve | 425869-001 |
| 71 | Shaft sleeve spacer | 425868-005 |
| 80 | Impeller | 427099-041 |
| 83 | Impeller washer | 425742-001 |
Showing 24 of 31 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 426401-002
Part Type Gasket / O-Ring
Fits Series 4380 1-1/2 x 1-1/2 x 6, 2 x 2 x 6, 3 x 3 x 6, 4 x 4 x 6W
Fits Series 4280 1-1/2 x 1 x 6, 3 x 1-1/2 x 6, 3 x 2 x 6, 3 x 2-1/2 x 6, 4 x 3 x 6W
Fits Series 4280-50 1-1/2 x 1 x 6, 3 x 1-1/2 x 6, 3 x 2 x 6, 3 x 2-1/2 x 6, 4 x 3 x 6
Fits Series 4030 1-1/2 x 1 x 6, 3 x 1-1/2 x 6, 3 x 2 x 6, 3 x 2-1/2 x 6, 4 x 3 x 6, 6 x 6 x 6
Fits Series 4300 1-1/2 x 1-1/2 x 6, 2 x 2 x 6, 3 x 3 x 6, 4 x 4 x 6
Drawing Item 4030: item 101; 4280: item 101; 4300: item 101; 4380: item 101; 4280-50: item 101
Shipping cost: Inquire
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