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Sight glass
Sight glasses's design supply a right way to ensure refrigerant of the system's quantity and the water content .we could see the refrigerant through sight glasses , so we could easily see the air bubble and gas in system , then we have know the refrigerant should be filled in or not .The element indicator which is in central position in sight glasses is very clever to water , it will changer hte colour with the water connect.
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sight glass level indicator