CK Worldwide uses a unique head assembly that provides the largest water jacket available in an 18 or 20 series torch. With this type of construction, CK provides over 4 x the surface area for maximum heat transfer versus competitive torch heads! INCREASED COOLING CAPACITY!! Over 4 x the surface area for maximum heat transfer Cooler running torches Longer consumable life Will hook up to standard cables and hoses Fail-Safe hose fittings (no wire ties required). Package of 1