autovent

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Auto Vent Opener Automatic Greenhouse Window Opener Cylinder Roof Vent Opener Autovent Kit Solar Heat Sensitive Agriculture Gardening Tools Automatic Greenhouses Supplies (Single Spring Lifts 15 Lbs) from $27.59	1-1/2 inch Tuuber Vent 2x Superior Seal Air Admittance Valve from $18.50
Maid O' Mist No. 67 Auto-Vent $17.26 from $13.70	Bayliss XL Autovent - Automatic Greenhouse Window Opener - Temperature Sensitive Solar Vent Opener from $48.11
Studor 20341 Mini-Vent Air Admittance Valve with PVC Adapter, 1-1/2- or 2-Inch Connection $29.10 from $22.09	Wiwir Greenhouse Automatic Window Opener Solar Heat Sensitive Auto Vent Opener Automatic Roof Vent Opener Agricultural Greenhouse Window Lifter Autovent Kit Lifts 15 Lbs(Single Spring) $27.69 from $26.99
Maid O' Mist No. 7 Auto-Vent from $34.31	Maid O' Mist No. 75 Auto-Vent from $50.35
Ycsst Automatic Vent Opener Standard Automatic Roof Vent Opener Solar Heat Sensitive Greenhouse Autovent Opener Standard-Lifts 15LBs for Hothouse Cold Frame Gardening Tools No Power Needed. from $26.99	Oatey 39012 ABS In-Line Vent 2X2 13/16, Sold as 3 Pack $15.00 from $12.77