Abstract: An apparatus for stopping the fluid flow through a pipe by freezing the fluid. The apparatus is for use especially in oil wells, gas wells, and the like. A head of arcuate shape has inwardly radially extending fingers whose purpose is to locate the pipe in the center of the head. The head is securely attached to a bar for supporting and transporting the entire device. The head has attached thereto a supply tube with jets radially extending from the supply tube toward the pipe. The jets supply a pressurized refrigerant about the periphery of the pipe, this refrigerant lowers the temperature of the pipe sufficiently to freeze the contents and thus stops the flow within the pipe.