Perlick 4303-5 Beverage Trunk Housing is designed for remote beer systems, featuring five 5/16" I.D. Bev-Seal Barrier beer lines that meet NSF standards. The product lines are both color-coded and number-coded for easy identification. It includes 1/2" O.D. copper coolant lines and is insulated with 3/4" thick thermal insulation to maintain optimal temperature. The outer wrap is made of black PVC that is flame-retardant for added safety. With a 3-1/2" diameter overall, this trunk housing is custom fabricated at the factory and is sold by the foot, allowing you to specify the exact length needed for your installation.