P28 Anthracite Grey UPVC Vitali Sliding Unit with 4 mm + 16 Air + 4 mm Glass

P28 UPVC is supplied in an anthracite grey colour with a Vitali sliding layout. The design is described as single rail, with two panels meeting in the middle, and uses a 4 mm + 16 air + 4 mm glass configuration as provided in the product data.