In apparatus wherein a fluid flow path is defined within a housing and leads from an inlet in the housing to an outlet therefrom, a shell-like member having a first opening therein for establishing communication with a length of hose and a second opening remote from the first opening bounded by an edge formation, configured so as to surround the housing inlet when the second opening is brought into overlying registration with the inlet, and means carried by the housing and hose assembly respectively for releasably securing the shell-like member to the housing with the second shell opening presented in overlying registration to the housing inlet.