Yellow Jacket, 18971, Vacuum/Charge Valve without 1/4" Side Port 4 - in - 1 ball valve tool is perfect for vacuum, charge, cores and recovery. Remove and replace Schrader cores without losing charge. Features: Extra 1/4" side port on the Vacuum/charge valve to attach electronic micron vacuum right at the system for greater accuracy or to add refrigerants Working pressure of 800 psi Made in the USA