SB-17/20/25 Single Coil Spring Water Pump Shaft Seal
SB-17/20/25 Single Coil Spring Water Pump Shaft Seal
SB-17/20/25 Single Coil Spring Water Pump Shaft Seal
Keep your in-line pump running leak-free with the SB-17/20/25 Single Coil Spring Water Pump Shaft Seal. Engineered for reliable, waterproof performance, this mechanical seal features a precision-matched stationary and rotary ring combination that creates a durable, secure barrier — preventing water from escaping around the pump shaft. Whether you're maintaining a domestic water pump, a garden irrigation system, or a light industrial in-line pump, this replacement seal delivers dependable sealing you can count on.
Key Features
- 100% New & High Quality — fresh from the factory, ready to install
- Stationary Ring: Carbon — hard-wearing and corrosion-resistant for long service life
- Rotary Ring: Ceramic — smooth, low-friction surface for optimal sealing contact
- Secondary Seal: Nitrile Rubber (NBR) — flexible, water-resistant gasket material that maintains a tight fit
- Spring: Stainless Steel Single Coil — maintains constant contact pressure between seal faces, resisting rust and fatigue
- Silicone Body Material — heat-tolerant and chemically stable for extended use
- Compatible Models: SB-17, SB-20, SB-25 — fits a wide range of single-needle lockstitch in-line pumps
- Waterproof & Secure — designed to prevent shaft leakage in pressurised pump environments
Specifications
| Model | SB-17 / SB-20 / SB-25 |
| Stationary Ring | Carbon |
| Rotary Ring | Ceramic |
| Secondary Seal | Nitrile Rubber (NBR) |
| Spring | Stainless Steel (Single Coil) |
| Body Material | Silicone |
| Package Includes | 1 × Pump Shaft Seal |
| Country of Origin | Made in China |
Installation Tips
Ensure the pump shaft is clean and free of debris before installing the seal. Lightly lubricate the NBR secondary seal with clean water or a compatible lubricant to ease installation and prevent tearing. Align the seal faces carefully to ensure full, even contact for a leak-free result.
Important Notes
- Due to manual measurement, there may be a ±5 mm dimensional deviation — please verify compatibility with your pump model before ordering.
- Slight colour variations may occur between product images and the actual item due to differences in display lighting and screen settings.
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Frequently Asked Questions
Q: Which pump models is the SB-17/20/25 shaft seal compatible with?
A: This mechanical shaft seal is designed to fit SB-17, SB-20, and SB-25 in-line water pump models. If you are unsure of your pump's model number, please check your pump's label or manual and compare shaft dimensions before purchasing, as a ±5 mm manufacturing tolerance may apply.
Q: What materials are used in this water pump seal?
A: The seal features a carbon stationary ring, a ceramic rotary ring, a nitrile rubber (NBR) secondary seal, and a stainless steel single coil spring — all housed in a silicone body. This combination ensures durability, corrosion resistance, and a secure, waterproof fit for in-line pump applications.
Q: How do I install this shaft seal correctly?
A: Before installation, thoroughly clean the pump shaft to remove dirt and scale. Apply a small amount of clean water or a compatible silicone lubricant to the NBR secondary seal to ease fitting. Carefully press the seal into the housing, ensuring the seal faces are flush and evenly seated. Avoid touching the polished seal faces to prevent scratching, which could cause leaks.
Q: Is this pump seal suitable for outdoor or garden pump use?
A: Yes. The stainless steel spring resists rust, and the ceramic and carbon seal faces handle continuous water contact well, making this seal a practical choice for garden irrigation pumps, water feature pumps, and similar outdoor in-line pump applications.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.