the force exerted by the flow of water in the direction 50 lifts the poppet 40 straight up from position 45 to position 70 the second component of said force deflects the water along the bottom surface 60 of the poppet 40 past the o ring 150 and out the chamber 80 of the housing 10 when the poppet 40 reaches position 70 retaining means comprising legs 110 which are capable of functioning as relatively stiff cantilever springs and which are affixed to the surface 60 of the poppet 40 engage the surfaces 200 of the housing 10 and block any further motion in the direction 50 the four legs 110 are spaced equally around the perimeter of the base 60 of the poppet 40 and their axes are parallel to the direction 50 the shape of the legs 110 is cylindrical except for the lower portion of each leg 110 which has a foot 210 perpendicular to the cylindrical body of each of the legs 110 the foot 210 associated with each leg 110 has several cam surfaces thereon surface 220 of each leg 110 engages surface 200 of the housing 10 to block further travel in the direction 50 by the poppet 40 once position 70 has been reached the cam surface 230 along the bottom of the foot 210 associated with each leg 110 is used during assembly to reinstall the poppet or to install it the.