## Common ground
All options are water storage tanks used for holding potable or non-potable water.
## Options at a glance
**3925.10 – Plastic material**
- **Defining trait:** Constructed primarily from polyethylene or similar thermoplastic resins, often lightweight and moldable.
- **Typical examples:** Above-ground residential tanks, rainwater harvesters, portable water containers.
- **Best fit when:** Lightweight, low-cost, corrosion-resistant storage is needed; ideal for home use or temporary installations.
**7309.00,7310,7323.93 – Stainless steel**
- **Defining trait:** Made from corrosion-resistant stainless steel (e.g., 304 or 316 grade), offering high durability and hygiene.
- **Typical examples:** Industrial water reservoirs, food-grade storage tanks, rooftop tanks in commercial buildings.
- **Best fit when:** Long-term use, high purity requirements, or exposure to harsh environments is expected.
## Key differences
| Feature | Plastic (3925.10) | Stainless Steel (73xx) |
|--------------------|--------------------------|-------------------------------|
| Material | Thermoplastic (e.g., HDPE) | Metal alloy (304/316 stainless) |
| Durability | Moderate, UV-sensitive | High, long-lasting |
| Corrosion resistance | Good (if UV-stabilized) | Excellent |
| Weight | Light | Heavy |
| Hygiene & purity | Good for non-potable | Ideal for potable/food-grade |
## How to choose
- Is the tank intended for residential or temporary use? → 3925.10
- Does it need to store drinking water in a commercial or industrial setting? → 73xx
## Overlaps & pitfalls
A tank may be made of plastic but have stainless steel fittings, or vice versa—this doesn’t change the primary material classification. The main function (e.g., potable water vs. rainwater) can influence choice, but the HS Code is based on material. If unsure, prioritize the **primary construction material** over accessories