These hefty pieces are constructed of 304 SS, designed for lifetime longevity. Printed clearly with "In" and "Out" so even after a few they're easy to work with. Available for both Beer Out and Gas In, with either Barbed or Flared connections. A flare fitting washer is recommended for use with this product. These are great for Torpedo kegs but these will work with any Ball Lock Cornelius Keg.