Sight glass liquid eye brass 3/8" m x 3/8 fm flare

What is for sale: Sight glass liquid eye brass 3/8" m x 3/8 fm flare

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3/8" Female Flare x 3/8" Male Flare
The Series 100 Allin Liquid Eye manufactured by Fast Components, Corp. has the unique "SEE-THRU" feature that is more readable than other sight glasses.
The dot on the tube is magnified when the tube is full of refrigerant to give you a quick, easy indication.
This pretested liquid indicator can be installed in any position in the liquid line.
When the line is FULL the opposite viewing port "eye" will appear enlarged.
If the line is EMPTY the opposite port "eye" will be smaller.
If bubbles are seen while the machine is running , the unit is short of refrigerant.