Easy Trim Cavity Vertical Extension Sleeve

The Cavity Vertical Extension Sleeve Is Designed To Be Used In Conjunction With The Telescopic Underfloor Vent. Each Extension Sleeve Allows The Vent To Vertically Reach A Further Two Brick Courses And Can Also Be Fitted To The Base Of The Telescopic Underfloor Vent Providing Horizontal Extension. Extends The Vent Vertically To Reach A Further Two Courses Can Be Used On The Base Of The Telescopic Underfloor Vent To Provide Horizontal Extension