facing opening adjacent the bottom of the sump 28 whereby very little liquid carry over will remain in the sump between consecutive uses of the dishwasher the intake 30 of the pump like the conduit 32 projects through an opening in the shroud in sealed relation therewith fig5 is an alternative embodiment of bead 52 shown in fig4 this alternative bead includes three parallel flanges 60 and a tip 62 all of which are flexible thus upon insertion of the bead 52 into a groove 54 the flanges 60 are flexed in an upwardly direction to provide a seal as well as to provide resistance to being removed therefrom tip 62 is bent upon insertion into groove 54 to further enhance the fluid tightness of the seal between bead 52 and groove 54 this is accomplished by tip 62 flexing to thereby bias in a resilient fashion against the bottom of the groove however it is still imperative that the width of the groove as compared to the effective width of the bead i e thickness of the bead after insertion into the groove with flanges flexed must be in the ratio of 4 to 5 it will be noted that groove 54 of the bottom wall 22 that defines the opening in which the pump motor unit is disposed is formed in a low level depression or downwardly recessed configuration whereby when the motor pump unit is installed through the wash chamber 14 and placed into position it will tend to self center on the support mechanism with the bead.