When selecting Tyco sprinklers, you must prioritize the K-factor (discharge coefficient), which determines the water flow rate, and the Temperature Rating, usually indicated by the color of the glass bulb (e.g., Red for 68°C/155°F). Additionally, verify the Response Type—choose Quick Response (QR) for life safety in residential/commercial areas or Standard Response (SR) for high-hazard industrial storage. Ensure the Thread Size (NPT or ISO) matches your local piping standards to avoid installation failures.