Abstract: A multiple service fitting for enabling through-floor passage of a plurality of different types of conductors, from a multi-cell underfloor raceway source thereof to an in-floor or above-floor outlet therefor.A mechanism operable from the accessible end of such fitting enables secure engagement thereof with the top walls of the multi-cell underfloor raceway without moving the fitting body portion, to compensate for floor slab deflection.A grommet and conduit extending tube, seated in and projecting from the opening in the top wall of the underfloor raceway cell, isolate and protect conductors passing therethrough.