Grohe 38845KS0 Velvet Black Skate Cosmopolitan Toilet Actuation Plate with Glass Surface. The Cosmopolitan Collection by Grohe is high-end, top-of-the-line series with award-winning designs, some of the finest materials, and the latest industry-leading technology. The Grohe 38845KS0 Velvet Black Skate Cosmopolitan Toilet Actuation Plate with Glass Surface is designed for dual flush or start and stop actuation with a AV1 pneumatic discharge valve. This vertical or horizontal plate features a one-of-a-kind velvet black glass finish that adds another level of customization to your bathroom. This Actuation Plate provides users with the ability to start and stop the discharge valve with a single push of a button.