Proflow’s UltraCool 304 Stainless Steel air conditioning fittings are available in Proflow’s big range of fittings and adaptors. Designed to be used with R-134A refrigerant the nylon tube core inside our 200 series braided stainless steel covered hose will work within a temperature range of -40°F to 250°F. Dress up your air conditioning with these stainless chrome or black reusable fittings with or without charge port.