This is a standard tire type fill valve, or Schrader valve. Also called a air fill valve, or or air tank valve, these valves are used to add air, to fill to pressure, or they can be utilized on pressure containers for gauging or other servicing. These Nickel plated brass valves are rated for over 150 PSI, and can be used with various gases, fluids and and at various operating pressures. These valve are also used on Nerf Rocket Launchers, and many of the JJMultilaunchers, including bait, tennis ball and t-shirt launchers.