Pipeline Seal & Insulator, Inc. has been manufacturing the LineBacker sealing gasket for over 40 years for the oil/gas industry. The patented and high performing LineBacker sealing gasket, works in all ANSI Class Flanges. The exclusive sealing element design is a “Quad” ring placed within a unique groove design, offering excellent recovery values in accordance to ASTM F-36. The LineBacker gasket features sealing solutions while reducing stress on flanges and bolts. All PSI sealing gaskets are manufactured to ISO 9001:2000 standards.