Alton | Thermofor Louver Window Opener Piston Replacement RV Carport 8mm double-wall (twin-wall) polycarbonate sidewalls:

8mm double-wall (twin-wall) polycarbonate sidewalls: Provides insulation

Note: this item is not available separately

so it requires no power source

Compatible Fly Screen Available

All hardware and instructions included

Alton | Thermofor Louver Window Opener Piston Replacement RV Carport 8mm double-wall (twin-wall) polycarbonate sidewalls:The Thermofor Louver Vent Replacement Cylinder is designed to restore smooth, automatic operation to your greenhouse louver vent opener. Compatible with Thermofor, Robinsons, and Alton branded louver openers, this replacement cylinder helps maintain proper airflow and temperature control without manual adjustment. Inside the cylinder is a heat sensitive wax core that expands as temperatures rise and contracts as they cool. This natural movement powers