Valve Type: Pressure Balance Features Cartridge Type: Includes Treysta Ceramic Disc Pressure Balance CartridgeIntegral Check Valve: Integral Check Valves in Cartridge Body to Prevent Cross-FlowWarranty: Covered by Gerber s limited lifetime warranty for manufacturing defects Description Mid-Town trim kit now includes the new Gerber Treysta Ceramic Disc Pressure Balance Cartridge. A Gerber Treysta rough-in valve body is required and is sold separately. Components Sold Separately Optional: For Use with Gerber Treysta Rough-In Valves G00gs50 or G00gs52 SeriesSold Separately Required: Deep Wall Extension Kit D113001 and Shallow Wall Extension Kit Ga663b11