The chilling unit effectively cools cold packs and keeps the packs in a chilled ready-to-use state. ColPaC C-5 mobile chilling unit with six standard and six half-size cold packs has closed-cell foam insulation. Drain valve for easy cleaning and defrosting. Stainless steel welded construction. Heavy-duty compressor. 3" swivel-type rubber casters for silent, friction-free movement of mobile units. ColPaC C-5 mobile chilling unit with six standard and six half-size cold packs.