Abstract: A nectar feeder for hummingbirds comprises a container, base tray, a base tray cover, a float, and a stopper thereon. The container, or bottle, is used for storing nectar feed. An exit port is defined on the bottom end of the container. The base tray is connected in fluid communication with the container and has at least one vertical member depending upwardly from a top surface of the base tray. A circumferential flange or ring is provided about the float for stabilization. The float engages the at least one vertical member to prevent substantial independent lateral movement of the float. In operation, the nectar feed flows through the container and into the base tray until the float rises to a level where the stopper mechanism engages the exit port to prevent fluid from flowing into the base tray.

Abstract: A valve system for accepting fluid from a source supply at an upper end thereof, and ejecting it into a liquid container located below the valve system, including a fluid ejection limiting float element control located at the lower end of the valve system, to limit the amount of fluid which can be ejected.

Abstract: For use with a watering trough fill control valve having float structure located to rise as water is filled into the trough via the valve, and to effect closing of the valve when the trough is filled to predetermined extent, the float structure located to fall as water level lowers in the trough, the float structure controlling a water inlet subject to freezing in closed position in winter, comprising an apparatus operatively connectible with the float structure for biasing the structure, so that it cannot completely close off ingress of water at the inlet as ambient temperature drops below water freezing level; the apparatus including a bimetallic control element.

Abstract: An apparatus for sensing changes in liquid level in a reservoir and adjusting flow of liquid into the reservoir to maintain the level at a selected height, the apparatus including a base member, a liquid conduit mounted on the base member, an arm hingedly mounted on the base member proximate a delivery end of the conduit, a stopper fixed to the arm and arcuately moveable into and out of engagement with the conduit delivery end, and a flotation body fixed to a free end of the arm and adapted to be engaged by the liquid in the reservoir.