Abstract: In a system comprising a pump, a source of gasoline, a hose, and a cutoff valve and nozzle with the hose attached at a distant end to the nozzle and the central end to the pump, the improvement which comprises providing at the distant end of the hose, a rupturable self sealing unit; the sealing unit is converted by movement of the cutoff valve and nozzle as would otherwise tear the hose or damage the pump while reliably and automatically sealing the hose to prevent dangerous spillage of fuel such as gasoline on a service station roadway surface.