Abstract: A double ended piston assembly is maintained in a cocked position in a stepped piston chamber under the influence of pressurized sensor gas. Loss of pressure results in the pistons being driven to an actuating position wherein a puncture element carried thereby fractures a frangible disc in a high pressure gas container. High pressure actuating gas from the container is then routed by the device to operate a responsive device.

Abstract: A spray gun for spraying viscous liquids such as resin has a pistol-grip handle on which a lidded container is cradled with a peripheral skirt of the lid clamped against a spray nozzle head, so that a nozzle inlet tube communicates with the container. Liquid is sprayed by compressed air supplied to the nozzle through the handle under control of a valve on the handle.

Abstract: A drip irrigation emitter or device comprising a flow restrictor helical thread on the outside of a main body, and a cap member that fits over the thread. Water is supplied to the interior of the main body and must flow through a narrow, annular passageway formed by the cap before the water flows through provided restrictor orifices, so no large particles are carried into the orifices or the helical thread to minimize plugging. The water discharges adjacent to the water tube or hose to minimize root intrusion into the irrigation device, and baffles also are provided to minimize root intrusion. The cap can be loosened or removed to flush the thread if foreign material enters the thread.