## Common ground
All options are hose connectors made from different metallic or plastic materials.
## Options at a glance
**3917.40 – Plastic material**
- **Defining trait:** Made from synthetic polymer (plastic), typically lightweight and corrosion-resistant.
- **Typical examples:** PVC, nylon, or polyethylene hose fittings.
- **Best fit when:** Used in low-pressure, non-high-temperature applications like garden hoses or fluid transfer in corrosive environments.
**7307 – Stainless steel**
- **Defining trait:** Made from corrosion-resistant, high-strength steel alloy; suitable for harsh environments.
- **Typical examples:** Marine fittings, industrial hydraulic systems, food-grade equipment.
- **Best fit when:** Requires durability, resistance to rust, and performance under high pressure or temperature.
**7412.20 – Copper**
- **Defining trait:** Made from pure or alloyed copper; excellent thermal conductivity and malleability.
- **Typical examples:** HVAC systems, refrigeration lines, plumbing joints.
- **Best fit when:** Used in applications requiring heat transfer or where soldering is involved.
**7609.00,7616.9X – Aluminium**
- **Defining trait:** Lightweight and corrosion-resistant; good for weight-sensitive or outdoor use.
- **Typical examples:** Automotive fuel lines, aerospace fittings, outdoor irrigation systems.
- **Best fit when:** Weight reduction is key and moderate strength suffices.
**8108.90 – Titanium**
- **Defining trait:** Extremely strong, lightweight, and highly corrosion-resistant; expensive and used in high-performance settings.
- **Typical examples:** Aerospace components, medical devices, high-end marine fittings.
- **Best fit when:** Maximum strength-to-weight ratio and extreme durability are required.
## Key differences
| Feature | Plastic | Stainless Steel | Copper | Aluminium | Titanium |
|------------------|-------------|------------------|-----------|-----------|------------|
| Weight | Light | Heavy | Medium | Very light| Very light |
| Corrosion resistance | Moderate | High | Medium | High | Very high |
| Strength | Low | Very high | Medium | Medium | Very high |
| Cost | Low | High | Medium | Medium | Very high |
## How to choose
- Is the connector used in a corrosive or high-pressure environment? → 7307
- Does it need to conduct heat (e.g., HVAC)? → 7412.20
- Is weight a major concern? → 7609.00,7616.9X
- Is cost the main factor? → 3917.40
- Is extreme strength and durability required (e.g., aerospace)? → 8108.90
## Overlaps & pitfalls
A connector may fit multiple categories if it uses mixed materials (e.g., aluminum body with plastic seal). However, the primary material determines classification. If unclear, prioritize the **main structural material**. No option is vague—each clearly defines a base material