the assembly along with piston 174 hold the slide member 140 in the correct position for communication referring now to fig4 a top view of the connector of this invention is shown landed on plate 110 referring now to fig5 a cross section view is shown of the connector of this invention with the valving closed seals 144 and 146 are in approximately the same position as seals 148 and 150 were in fig3 causing both ends of the flow path 142 to be sealed against central bore 132 the effect of this is that the flow into or out of bore 134 is sealed off with the slide member 140 acting as a shutoff valve referring now to fig6 a cross section view of the connector of this invention with the valving closed and the upper section separated from the lower section as it would be when landing the lower marine riser package on the lower blowout preventer stack or removing the lower marine riser package from the lower blowout preventer stack when engaging the diameter 180 on the mandrel 114 first engages diameter 182 of upper body 130 to provide concentricity alignment between the mandrel and the upper body this diametrical engagement ensures that the diameter indicated at 184 which will be sealed by seals 146 is closely aligned.