Description
Overview:
This O-Ring 21x2.5 is a Genuine Stihl part designed to seal high‐pressure connections in Stihl pressure washers. Made from a durable black rubber elastomer, it forms a tight seal to prevent water leaks and maintain operating pressure across fittings and joints. The size is 21 mm x 2.5 mm (approximately 0.83 in x 0.10 in), suitable for precise sealing in the specified assemblies on selected machines such as the Stihl RE361 and RE661. It is a direct replacement identified by MPN 9645 951 7666, offering reliable fit and performance in routine servicing or repairs. Ideal for tradespeople and DIY users who need a dependable seal to keep cleaning performance consistent and reduce downtime.
Key Features:
- Genuine Stihl OEM part for assured compatibility and quality
- Size 21 mm x 2.5 mm (0.83 in x 0.10 in) for accurate, repeatable sealing
- Tough rubber elastomer construction to withstand typical pressure washer conditions
- Helps restore and maintain operating pressure by preventing leaks at joints
- Round cross‐section provides even compression and reliable sealing
- Simple, quick installation as a like‐for‐like replacement-no modifications needed
- Suitable for preventative maintenance to minimise water loss and pressure drop
- Supports long service intervals when used with clean mating surfaces
Typical Applications:
Used at hose couplings, pump outlets, lance/trigger gun connections, and quick‐connect adapters on Stihl pressure washers. Fit when a seal shows flattening, cracking, or leakage, or during routine overhauls. Helps keep pressure stable for effective cleaning of patios, vehicles, tools, and site equipment.
Also known as:
O‐ring seal, sealing ring, washer seal, rubber gasket ring, pressure washer seal, connector seal, pump seal ring.
Fits Models:
RE 360 K, RE 360 K PLUS, RE 361, RE 361 PLUS, RE 460 K, RE 461, RE 461 PLUS, RE 471, RE 471 PLUS, RE 551 PLUS, RE360K, RE360KPLUS, RE361, RE361PLUS, RE460K, RE461, RE461PLUS, RE471, RE471PLUS, RE520W, RE521, RE550W, RE551, RE551 PLUS, RE551PLUS, RE580W, RE581, RE660W, RE661, RE880W, RE961
Alternate Part Numbers:
9645-951-7666, 96459517666
Product Specifications
| L&S Part No. | 9645 951 7666 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 96459517666 |
| Unit of Sale | 1 |
| Applications | RE 360 K, RE 360 K PLUS, RE 361, RE 361 PLUS, RE 460 K, RE 461, RE 461 PLUS, RE 471, RE 471 PLUS, RE 551 PLUS, RE360K, RE360KPLUS, RE361, RE361PLUS, RE460K, RE461, RE461PLUS, RE471, RE471PLUS, RE520W, RE521, RE550W, RE551, RE551 PLUS, RE551PLUS, RE580W, RE581, RE660W, RE661, RE880W, RE961 |
| Machine Type | Pressure Washers |
| Fits Brands | Stihl |
| Fits Models | RE520W, RE550W, RE580W | RE521, RE551, RE581, RE551 PLUS | RE660W, RE880W | RE661, RE961 | RE 360 K, RE 360 K PLUS, RE 460 K | RE 361, RE 461, RE 471 |
