Abstract: A filter for a conventional water jug having a valved tap near the bottom of its cylindrical side wall comprises a pan-like case member that seats in the bottom of the jug and has a filter cartridge removably sealed across its open top. An aperture in the axially short cylindrical side wall of the case member communicates its interior with the inwardly projecting tubular tap inlet. A radially projecting tubular collar on the case member cooperates with an O-ring to provide a seal between the interior of the case member and the tap inlet. A tacky, water-insoluble adhesive area on the underside of the bottom wall of the case member secures it to the bottom wall of a jug. The filter cartridge can comprise blow molded shell halves, filter paper discs, and activated charcoal confined between the discs.

Abstract: A freezer alarm sensor has a body in which there is an elongated vertically extending chamber. Contactors connectable in an alarm energizing circuit, normally insulated from one another, are exposed in the chamber, near one of its ends and diametrically opposite one another. A current conducting slider is freely slidable in the chamber between a raised position spaced from the contactors and a dropped position engaging the contactors and electrically connecting them. The chamber is partially filled with material that is solid at temperatures below a predetermined value and by which the slider is bound to the body and thus held in its raised position, but said material melts at temperatures above that value, releasing the slider to fall to its dropped position. Also disclosed are a heat sensor and a flood sensor embodying principles of the invention.