Abstract: The invention presented is a tapered joint thread system, especially for use in a fluid handling device, and a fluid handling device containing the inventive tapered joint thread system. More particularly, the invention presented includes a plastic female end segment having an opening sized to receive a male fitting, and having a first tapered segment which tapers from a first internal diameter to a second internal diameter, and which is gauged from the opening of the female end segment to a controlled depth; the female end segment also has an unthreaded non-tapering segment having the second internal diameter which extends from the controlled depth to a second controlled depth, and an angled shoulder which tapers from the second internal diameter to a third internal diameter and which extends from the second depth to a third controlled depth.

Abstract: An overtravel indicator for a piston received in a cylinder having an end wall toward which the piston moves includes an elongated indicator rod slidably mounted through a dielectric bushing in the end wall. A conductive garter spring is compressed between the indicator rod and a groove in the cylinder end wall. An electric circuit including an electrically operated indicator is connected for completion through the indicator rod, end wall and garter spring. In an inward armed position of the indicator rod, dielectric material carried by the rod is interposed between the rod and garter spring for opening the electric circuit. In an outward operated position of the rod, a conductive surface on the rod engages the garter spring to complete the circuit and operate the indicator.