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Best Choice New Bayliss Greenhouse AUTOVENT XL BAYLISS GREENHOUSE AUTOVENT XLNew Automatic Window Opener - Bayliss Easy to fit, screws into wood and clamps onto aluminium greenhouses without the neeed for drillingBest Value New Bayliss Automatic Autovent Greenhouse Window Opener x 2 2 x Bayliss AL Autovent Automatic Vent OpenersNew Bayliss MK7 Automatic Vent Opener Suitable for opening greenhouse roof windows 76cm x 76cm weighing up to 26lbsNew Leafy Creations Replacement Cylinder Compatible With Bayliss XL Greenhouse Window Opener. Greenhouse Spares for Window A Replacement cylinder compatible with Bayliss XL autovent greenhouse window openers.New AMK® Bayliss XL Solar Greenhouse Automatic Window Opener Auto Roof Vent Autovent for Green House Reliable, quality built anodised aluminium automatic window opener for greenhouses.New Automatic Greenhouse Window Opener Autovent with Opening Force 7KG Opens from 17-25C Easy to install and does not need electricity as it uses the heat from the sun.New Leafy Creations Silver Greenhouse Window Opener Automatic. Temperature Controlled Greenhouse Accessories Auto Vent. (Bla Silver greenhouse window openers suitable for Aluminium and Wooden frames.New Piston for Greenhouse Vent Opener 15Kg Lift Automatic Window Cold Frame Cylinder Replacement piston for your vent opener with 10mm screw thread (please check you existing piston).New Automatic Greenhouse Roof Vent Opener - Autovent Opens and closes standard greenhouse windows automatically