The present invention relates to a duckbill conservation vent valve comprising an elastomeric tubular body having an axial fluid passageway with an inlet and an outlet. The tubular body progressively narrows in cross section from inlet to outlet, forming opposed sealing lips at the outlet. The lips define a closed slit therebetween. The slit is opened in response to pressure exerted from the inlet in the direction of the slit. The slit is kept closed by means such as applying either external or internal force on opposing ribs which extend radially from the tubular body or by draping a long lip over a slit and a short lip, or by stretching a short lip to equal the length of a long lip and attaching the short lip to the long lip. The duckbill conservation vent valve is capable of being opened by pressure heads of less than about 2 inches of water.

The self-closing cap for resilient dispenser-containers to be mounted to the aperture of the neck of the dispenser, comprises a channel member having a flat member issuing from one side of the aperture, parallel to the rectilinear axis of the neck; a reed being a stiffly flexible member fastened parallel to the channel member on the aperture, the reed being mounted to be urged at its uppermost terminal end contiguously with the upper portion of the interior side of the channel member; and means for enclosing the respective sideward edges of the channel member and the reed. A further primary embodiment of the self-closing cap for resilient dispenser-containers to be mounted at the aperture of the neck of the dispenser comprises a pair of reeds mounted parallel to opposing sides of the aperture, the reeds being fabricated of a suitable stiffly flexible material, and the reeds being mounted to be urged together to contiguously contact each other at their upper portions; and means for enclosing the sideward edges of said reeds.

An in-line valve is composed of a plurality of cone shaped sections, each of said sections having a number of segments, said segments having relief openings or orifices except in the final section, said segments being mounted within the oversized housing which connects to the conduit means, said segments being pivotably connected to said housing by a hinge and rib means so as to deploy the segments automatically to form the cone shaped valving section.

A drain control device adapted to be installed in a floor drain or the like and includes a device which prevents the backflow of water or other flowable material up through the floor drain. An expandable annular member is sealingly engaged with a floor drainpipe and includes a depending generally conical body divided into a plurality of circumferentially spaced and longitudinally extending segments capable of extension and contraction to enable flow in one direction and prevent backflow. A funnel-shaped device is inserted into the upper end of the drain control for guiding material downwardly into the drain control and preventing such material from becoming lodged on the upper end of the annular, peripherally expandable resilient body.

A self-contained portable toilet that has a bowl which is mounted on a support bucket or holding tank. The bowl has an outlet port for discharging the contents of the bowl into the bucket, and a closure means for the outlet port is provided which comprises a flexible diaphragm movable between a first position in which it closes the port and a second position in which it uncovers the port. Means are provided to tension the diaphragm into contact with the outlet port when the diaphragm is in its first position so as to seal the port closed. A flush lever is provided for moving the diaphragm between its first and second positions. A flush water storage chamber is contained within the portable toilet and a hand pump is provided in association with the storage chamber for discharging flush water into the bowl.