The HOME-FLEX striker plate should be used when CSST is installed behind a wall, floor or ceiling. It will protect CSST from nail screw punctures. Required by most local codes for CSST installations. Heat treated and hardened to deflect puncture threatsUse when routing CSST through blind area like walls and crawl spaces to prevent damage of CSST tubing.Special care should always be taken when installing CSST.CSA approved for use with VPC Alpha-FLEX CSST.Installers should be certified to install HOME-FLEX CSST.