Nice replacement component. The Shark 8.721 129.0 721 129 0 Oil Seal Piston Rod Buna N Karcher matched the description and restored normal operation. Shipping updates could be better.

8.721-129.0 OIL SEAL, PISTON ROD (BUNA-N)
| Part number: | 8.721-129.0 |
|---|---|
| SKU Number: | SRK-8.721-129.0 |
| Warranty: | 1 Year |
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On Qualifying Orders of $50 or More
$48.49
Product Description
Product Features
8.721-129.0 OIL SEAL, PISTON ROD (BUNA-N) Repair Part
The 8.721-129.0 OIL SEAL, PISTON ROD (BUNA-N) provides a direct replacement option when the original component becomes worn or damaged. Using the proper repair part helps maintain reliable operation and keeps equipment functioning as intended.
With the right replacement component such as the 8.721-129.0 OIL SEAL, PISTON ROD (BUNA-N), maintenance work can focus on restoring the specific part that has experienced wear. Proper replacement parts help keep equipment dependable and support consistent operation across demanding jobsite conditions.
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Megan Y.
24 Nov, 2025