Compatibility checks before quotation
| Check item | What to confirm |
|---|---|
| Replacement intent | State direct AirTAC, HKQD alternative, or no brand preference. |
| Model code | Send the full model, partial code, or label photo. |
| Compatibility | Check dimensions, voltage, thread, and mounting before substitution. |
| Mixed list | Group cylinders, valves, fittings, and sensors in one quotation list. |
