Alton | Thermofor Roof Vent Opener Piston Replacement Partyhouse for additional strength and rafter

for additional strength and rafter stiffness

Current: 10

9% harmful UV radiation that won't yellow or become brittle over time

and protective wire guards ensure reliable

Alton | Thermofor Roof Vent Opener Piston Replacement Partyhouse for additional strength and rafterThe Thermofor Long Piston Replacement is a direct replacement cylinder designed for Thermofor automatic roof vent openers used in Alton greenhouses. If your current opener is no longer responding properly to temperature changes, replacing the piston is a simple way to restore reliable, automatic ventilation. This heat sensitive cylinder contains a wax core that expands as temperatures rise and contracts as they cool, driving the vent to open and close