The Perlick 4220-12 Beverage Trunk Housing is designed for remote beer systems, featuring twelve 3/8" I.D. Bev-Seal Barrier product lines that are both NSF-certified and color-coded for easy identification. Each line is number-coded for added convenience. The housing includes 1/2" O.D. copper coolant lines and is insulated with 3/4" thick thermal insulation to maintain optimal beverage temperature. Its durable black PVC flame-retardant outer wrap ensures safety and longevity. With a 4-1/4" diameter overall, this custom-fabricated trunk housing is sold by the foot, allowing you to specify the exact length needed for your installation.