Engineered specifically to replace the manual vent arm in any Palram / Deluxe or Snap & Grow model greenhouses. Opens vent at warm temperature, closes when temperature cools using a temperature sensitive piston.
Calibrated spring tensions
Resists wind damage when opening or closing
No need for electricity or controllers
Strong, durable, corrosion-resistant components
Works with all Palram, Snap & Grow & Deluxe model greenhouses