LineBacker Isolation kits utilize a patented a rectangular sealing element, referred to as a Quad Ring in combination with a unique grove design to affectively seal and isolate flanges of all types. With the unique Quad Ring design, elastic memory is provided for elastomers not normally associated with this characteristic. Materials such as PTFE, Kalrez, and Aflas may be used as sealing elements which dramatically increase the options available for matching isolation kit materials to service and environmental conditions. The greater variety materials also provide excellent temperature and chemical range compatibility. LineBacker Isolation kits are self energizing with theoretical near zero M and Y factors, resulting in effecting a positive seal without excessive bolt loads required with flat gaskets.