Abstract: A valve housing encloses an upward valve seat connected to the water inlet. A valve chamber above the seat receives a valve element and has a lateral bypass chamber connected to a fitting which leads to the filter. A tubular valve stem/outlet spout above the valve element is spring-pressed downward, normally holding the valve element down on the seat and may be raised by a handle allowing the valve element to raise to permit water to flow through the bypass to the filter. Filter discharge water is connected to a bypass return fitting on the valve housing which conducts water to a chamber surrounding lower part of the stem and into the stem through a radial opening and up and out the spout.

Abstract: The faucet is installed with the use of a pair of interfitting plates, one, the base plate, secured to the bottom of the faucet base, the other, the installation plate, secured to the sink over the access hole in the sink. The installation plate has upstanding elements which fit into narrowing openings in the base plate. When the plates are brought together and the base is turned for 20.degree. or so, the elements wedge against the sides of the openings respectively to give a tight fit, securing the faucet to the sink. A resilient seal urges the faucet base upward, enhancing the attachment.

Abstract: The faucet includes a unitary valve stem, the lower end of which is tapered and sits in a cup-shaped valve element for low-friction connection and easy rotary adjustment of the faucet outlet.

Abstract: This faucet has a base assembly with an air break module for the brine waste from a reverse-osmosis filter. The break outlet at the bottom of the break pocket has an angled fitting which aims the downstream waste up out of the base assembly in event of a backup. The faucet includes a unitary valve stem, the lower end of which is tapered and sits in a cup-shaped valve element for low-friction connection and easy swiveling adjustment of faucet outlet. Finally, the faucet is installed with the use of a pair of interfitting plates, one, the base plate, secured to the bottom of the faucet base, the other, the attachment plate, secured to the sink around the access hole in the sink. The attachment plate has upstanding outward ears which fit into tapered openings in the base plate. When the base is turned, for 20.degree. or so, the ears wedge against the sides of the openings respectively to give a tight fit, securing the faucet in the sink.