A faucet of the single handle mixing valve type. The faucet includes a housing having a domed housing cap enclosing a valve cartridge having an actuating stem movable along a vertical flow-control axis for varying water flow rate, and movable along a horizontal temperature-control axis for varying the temperature. A handle is connected to the actuating stem. A recess extends vertically along the outer surface of the domed housing cap. A releasable stop member is adapted to engage the recess when the handle is moved along the vertical flow-control axis in its cold water only position, and adapted: to release engagement upon application of a horizontal force. A ramp is located along the lower periphery of the domed housing cap outside of the cold water only position and is adapted to prevent the handle from being lowered into a full off position except when in the cold water only position.