Abstract: An in-line accessory faucet having a separable plastic air-gap module for use with a reverse osmosis unit, the faucet being installable without the module when used without a reverse osmosis unit. The air-gap module slides onto the faucet pipe conduit below the housing, and has brine flow passages and a channel formed in the top surface and closed off by the overlying flat surface of a base member between the housing and air-gap module. A valve seat in the housing connects to both the housing and the pipe conduit. The valving in the housing has an in-line configuration, with the faucet inlet and outlet being on a common central axis. A mounting nut with an expandable - collapsible portion and peripheral side channels for brine tubes permits mounting of the faucet solely from above the sink lip. A handle with two lower camming surfaces is operated only downwardly to obtain both pressure - controlled flow or locked-on flow.

Abstract: A spray aerator essentially of simple plastic parts having a swivel faucet attachment, a water conduit pipe, lateral openings in the pipe wall above its closed lower end, a spray housing slidable on the pipe, first and second housing inserts within the spray housing and slidable on the pipe, a flanged flexible snap retainer having downwardly depending legs and snapped over the lower pipe end into a groove to retain the spray housing and housing inserts on the pipe, a spray insert snapped over a ledge at the lower end of the spray housing, the spray insert having outer spray holes and an inner cylindrical tube for an aerator housing, an aerator assembly mounted in the aerator housing and supporting the first housing insert thereabove, and the snap mounting of the spray insert and snap retainer being the only means holding the spray aerator assembled and retained in the conduit pipe.