Uniwelds vv1 vapor vue visible vapor charging device absorbs heat naturally and flashes liquid refrigerant from the cylinder and charges in the system as a vapor. Connecting the vapor vue to the low side of your charging manifold will enhance the charging rate up to 8 times faster and the liquid is governed by adjusting the manifold valve as well as overseeing the vapor rate through the double sight glass. Vapor vue is factory pressure tested at 800 psi and Designed for application to charge any refrigeration & air conditioning system using CFC, HCFC, And R-410A refrigerants & hfc, Zeotropic, And azeotropic refrigerants without the risk associated with liquid slugging and damaging 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.