This 90mm Shower Waste is suitable for any shower tray that has the British standard waste hole. Specially designed to enable water to flow from the shower tray at a rate greater than 32 litres per minute. Maintenance and cleaning is achieved through the quick release inner unit. Description of the 90mm Shower Waste: Fully flexible to ease installation of the shower tray waste and solves most waste plumbing problems. Designed to fit directly to the shower tray waste and the standard 40mm (1 ) waste pipe.