AC Hoses, Hose Kits and Fittings. Cold Hose is an automotive air conditioning fitting and hose website. We carry a full line of a/c fittings, hoses, charge adapters, and oring seals. All the fittings and hoses are indexed by size and or thread size. Cold hose has weld on barbs, compressor adapters, and much more on the specialty fittings page.