Unit Liner Company - Solving Problems Since 1967 Providing Nationwide Sales and Installation of custom lining systems since 1967. Call Us At 1-800-633-4603 Welcome to Unit Liner Unit Liner is your primary source for tank liners, pit liners, plating tank liners, lagoon liners, and galvanized metal secondary containment rings. March 29, 2007: Unit Liner Secondary Containment Structure Shows Exemplary Resilience in Texas Fire A Unit Liner secondary containment structure served its purpose in a recent fire in Cresson, Texas. The fire, presumed to have been started by a lightning strike, caused sev