Browse a collection of refrigeration line sets and covering at F.W. Webb. A line set consists of copper tubes that connect the condenser to the evaporator coil in an HVAC unit. Made in durable PVC, plastic, or copper, line coverings and vertical, duct, and flat elbows protect wires, pipes, and other parts of an HVAC system. Use our helpful filters to sort line sets by size, finish, end connection, bend angle, and other variables. Explore refrigeration line sets and coverings from trusted makers Rectorseal (Fortress), AC Cover Guard, and Airex to find the right match for your HVAC/R system.