These Liquid Level Gages feature a durable Trogamid sight and aluminum alloy base and cap.  The square shank with pipe thread screws vertically into a tapped hole on the top of a reservoir. The leak proof construction, large vent hole and unrestricted passages permit fast and accurate liquid level response. Straight Nylon Gages can be used on oil bearings, gear boxes, crank cases, transformers, switches, or any application requiring visual indication of liquid flow.