Tube 1/2 (12mm), can fit 1/2 Tube OD. [Premium Quality ] MuHize compression sleeves ferules are made of brass but light weight material good toughness, high strength, features corrosion resistance and wear resistancee, strong pressure resistance, they are also very easy to assemble. 50PCS Ferrule Fittings MuHize 1/2 Inch Brass Compression Fitting Kit - 50 Pieces Lead-Free Ferrules, Ferrule Sleeve For Hydraulic Air Water Oil Lines(Premium Industrial Grade Tube Fitting Connectors For Air Water suitable for connecting copper, brass, aluminum, or plastic tubing. Brass Copression Fitting Ferrule Sleeve,1/2" Tube OD (50pcs [Excellent Pressure Resistance] MuHize brass compression sleeves have 3000 PSI working pressure, and apply to temperature range of -65°F to 250°F (-53°C to 121°C). Like cylindrical shaped, bulging in the middle but two edges’s diameter are smaller than the belly part so that it could ensure the reliability of a compression seal. The rich quantity can perfectly meet your daily actual needs and applications. Good sealing performance, no leaks. Like cylindrical shaped, it is bulging in the middle but two edges’s diameter are smaller than the belly part so that it could ensure the reliability of a compression seal NOTE: Please confirm your pipe size before purchasing. Snapklik.co : uHize 3/16 Brass Copression Fitting Sleeve Ferrule This brass compression sleeves ferrule is widely used in pipe connection for hydraulic and pneumatic systems, HVAC, humidifiers, etc. It is more convenient for storage. The product selection is strong and can meet your daily use and replacement Wide Range of Uses: This brass insert is widely use for hose connections in hydraulic and pneumatic systems, HVAC, humidifiers, etc., and quickly and easily connects water, air, fuel, oil and inert gas pipelines They are used for fixed locking of copper pipe and hard pipe, PU tube, nylon tube or hard plastic tubing.