The valve body is machined from 316L stainless steel.
Available in "S" Clamp (K30SA style) and Bevel Seat (30SA style). The "S" Clamp or Bevel Seat (nut) is used to attach the valve to a mating ferrule which is permanently attached to the tank.
The valve is spring hold closed and is opened by pushing the stem toward the tank against the spring force