Abstract: A low volume irrigation sub-assembly is dimensioned to be removably fitted in an extensible riser of a conventional pop-up spray housing. The sub-assembly has an upstanding low volume emitter extending generally axial to the direction of elongation of the housing and the riser, and includes a filter and flow control device for restricting the pressure of water passing between the interior of the riser and the emitter aperture.

Abstract: A plastic disposable canister for use with a conventional paint spray gun. The canister is a cylinder having a closed bottom, an open top, and two diametrically opposed external stiffening ribs extending the height of the canister. The canister includes two diametrically opposed cover engaging members formed from the upper portions of the stiffening ribs for engagement with the most commonly available paint sprayers.

Abstract: A piezo-electric transducer type pressure sensor such as a silicon pressure sensor or the like is provided in a low path of fluid located in the midway between a valve section and a nozzle ejection port in a fluid ejection gun. When foreign matters in the fluid block the nozzle and hence the ejection from the nozzle becomes an abnormal condition, a fluid pressure variation produced in the flow path between the valve section and the nozzle ejection port is detected in the form of an electric signal by means of the piezo-electric transducer type pressure sensor.