The Perlick 4303-12 Beverage Trunk Housing is designed for remote beer systems, featuring twelve 5/16" I.D. Bev-Seal Barrier beer lines that meet NSF standards. Each line is color-coded and number-coded for easy identification. The housing includes 1/2" O.D. copper coolant lines and is insulated with 3/4" thick thermal insulation to maintain optimal temperature. The durable black PVC outer wrap is flame-retardant for added safety. With an overall diameter of 4-1/4", this custom-fabricated trunk housing is sold by the foot, allowing you to specify the exact length needed for your installation.