This is made in Germany, assembled in the USA. This disconnect is NSF approved, FDA approved materials, and has SK approved materials(European). This is a gas disconnect for a Cornelius or Firestone pin lock keg. This disconnect has an internal check valve that will allow the gas to flow out, while stopping back flow of liquid back into your system. This disconnect has a 1/4" MFL that can use and of the hose on our site using the swivel nuts (1/4" for 3/16 or 1/4" hose or 5/16 for the 5/16 hose). The metal collar is SS for a longer lasting and a more durable disconnect.