SG is sight glasses for low pressure application (Max Working Pressure 500 psig). SG is available with flare, solder and socket connections, and with and without moisture indicators. SG and SGR, without moisture indicator, are mainly used to indicate the condition of the refrigerant in the liquid line or the flow in the oil return line from the oil separator. SGI / SGN and SGRI / SGRN are equipped with sensitive indicators that reflects a changes colour, depending on the moisture content in the refrigerant.
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