Application: Used to permanently seal microscopic leaks and provide ongoing protection in active AC and refrigeration systems. Sizing: The LS-2 model is formulated for larger systems, protecting units from 1.5 up to 5 tons (18k to 60k BTU). (Note: The smaller LS-1 version covers systems up to 1.5 tons). Key Feature: It is designed to remain contaminate-free and will not clog standard HVAC equipment, line sets, or recovery units.