The aviation industry’s test system of choice. Used over 10 million times a year around the world. A syringe fitted with a Water Detector capsule only takes a matter of moments to check the fuel at any stage of the delivery system. The WD is the most cost-effective safety measure for your operation. The WD is a device for determining the presence of finely dispersed undissolved water in concentrations lower than those normally detectable by visual examination.