The 1” Rubber Repair Kit 350 is a complete replacement solution for the internal rubber components of 1” 350 and 350XL double check valve assemblies. This kit restores proper sealing and performance of both check valves, ensuring reliable operation without the need to replace metal parts. Ideal for routine maintenance or minor repairs, it helps maintain compliance with ASSE® 1015 and CSA® B64.5 standards. Durable and easy to install, it extends the life and efficiency of your backflow preventer.