Reusable Therapy - 15 1/2"W x 21"L x 33"H ColPaC Chilling Units - C2 Compact Unit - 15 1/2"W x 21"L x 33"H Comes with six standard-size ColPaCs. ColPaC Chilling Units Cool Pacs Quickly and Keep Them Handy Specially designed to chill ColPaCs quickly and effectively, these units will ensure that patients never have to wait for cold pac therapy. Mounted on rubber casters for silent mobility, they're made of stainless steel with a heavy-duty compressor and foam insulation for energy efficiency. Drain valve for easy cleaning and defrosting. No plumbing required, UL listed.