Abstract: A disposable normally closed all plastic reciprocating valve is adapted to be used in a supply line for fluids supplied to or extracted from a patient. The valve is opened by inserting a tube into one end thereof.

Abstract: A light weight, low cost, non-corroding, high efficiency solar energy collector is comprised of an absorber plate which is adapted to absorb solar energy in the form of heat and to transfer by conductance the heat to a heat exchange medium. The absorber plate has disposed therein a highly heat conductive filler which imparts increased thermal conductivity to the plastic material of the absorber plate, and an energy absorbing pigment; or a sheet of a transparent plastic material is employed which transmits solar energy to a heat exchange medium which has dissolved therein a dye or pigment of a solar energy absorbing color. For a greater thermal conductivity, the sheet of transparent plastic material may have disposed therein a thin sheet of metal which absorbs and conducts heat to a heat exchange medium.