## Common ground
Both options refer to a coolant manifold assembly, a component that distributes coolant in an engine or cooling system.
## Options at a glance
**8481.90 – Parts of valves**
- **Defining trait:** Designed primarily as a functional part within a valve system, not specifically for vehicles.
- **Typical examples:** Manifold used in industrial cooling systems, HVAC units, or machinery with integrated valve control.
- **Best fit when:** The assembly is used in non-automotive equipment where it functions as part of a valve mechanism.
**8708.99 – Used in passenger vehicles**
- **Defining trait:** Specifically intended for use in passenger vehicles, emphasizing automotive application.
- **Typical examples:** Coolant manifold in a car engine block or radiator system.
- **Best fit when:** The product is designed, marketed, or installed in cars, SUVs, or light-duty passenger vehicles.
## Key differences
| Feature | 8481.90 (Parts of valves) | 8708.99 (Used in passenger vehicles) |
|-----------------------|-------------------------------|----------------------------------------|
| Primary application | Industrial/machinery systems | Passenger vehicles only |
| Functional focus | Valve integration | Vehicle engine cooling |
| End-use context | General industrial use | Automotive OEM or aftermarket |
## How to choose
- Is the manifold used in a passenger vehicle (car, SUV)? → 8708.99
- Is it part of a valve system in non-automotive equipment? → 8481.90
## Overlaps & pitfalls
A coolant manifold may serve both purposes—e.g., used in a vehicle but also functionally similar to a valve component. If the product is clearly designed for vehicles, prioritize **8708.99**. If it's used in industrial systems and not marketed for vehicles, use **8481.90**. The main function (automotive vs. general valve system) determines the correct classification. When in doubt, choose based on the product’s primary intended use