Elesa and Ganter manufacture a large range of hydraulic accessories including fluid level sight glasses, fluid level indicators, sight glasses and fill/drain plugs. Sight glasses and fluid level indicators provide a means to view the level of fluid in a container or tank. These are available in metal, plastic, glass and stainless steel. This section also includes threaded plugs, pipe plugs, drain plugs, and filler breathers. These items are also referred to as liquid level indicators, oil gauges, oil windows, oil dipsticks and dip sticks.