Uniweld Vapor Vue™ Charging Device 1/4" Female Flare x 1/4" Male Flare. The Vapor Vue™ is a visible vapor charging device that absorbs heat naturally and flashes the liquid refrigerant from the cylinder and charges into the system as a vapor. Connecting the Vapor Vue™ to the low side of your charging manifold will increase the charging rate up to 8 times faster and the liquid is controlled by adjusting the manifold valve and monitoring the vapor rate through the double sight glass. Vapor Vue™ is factory pressure tested at 800 psi and can be used to charge any refrigeration system & air conditioning system using R410A, CFC, HCFC & HFC, Zeotropic and Azeotropic refrigerants without the danger of liquid slugging and destroying the compressor. Placing the manifold and Vapor Vue™ over hot discharge airflow of the condensing unit will increase the heat exchange and charging rate efficiency. Patent pending.