Anti-odour:  Silicone membrane cartridge with external bi-injected washer guarantees a perfect seal.  No more bad smells, no more pipe noises, no more back-siphoning.  . Bi-injected washer under the tray for a reliable installation guaranteed 100% leak-proof.  High performance fixing to the shower tray thanks to the stainless-steel fixing plate and stainless-steel screws with brass inserts.. Independent hair catcher is removable from above, without removing the cartridge for quick and easy cleaning.  For a deeper clean and direct access to the pipework, the complete cartridge can be completely removed.  . Very efficient flow rate up to 32 L/min: better than British Standard requirements.