cap 40 a limit sleeve 46 is mounted between the cylinder head 22 and the t cap 40 the poppet shaft 42 extending through the limit sleeve 46 for limiting the downward travel of the poppet the limit sleeve 46 stops downward travel of the poppet 32 when the barrel 44 of the t cap 40 reaches the limit sleeve 46 the solenoid 50 comprises a solenoid coil 52 mounted on a spindle 54 coaxial with the poppet shaft 42 when the solenoid coil 52 is energized the flange 41 of the t cap 40 is attracted toward the spindle 54 moving the poppet shaft 42 and thus the poppet downward opening the valve a spring means is provided between the cylinder head and t cap 40 for biasing the t cap away from the cylinder head and thus for biasing the poppet in the closed position the spring means acts to return the poppet to its valve seat and close the valve immediately after power is removed from the solenoid coil in fig2 the spring means is an elastomeric housing 60 which also acts as an enclosure for the solenoid 50 the elastomeric housing 60 is cylindrical is coaxial with the poppet shaft 42 and has two housing ends 62 one of the housing ends 62 extends against the flange 41 of.