YELLOW JACKET's 1/4-in.,4-in-1 ball valve tool is ideal for vacuum, charge, cores and recovery. The tool enables the user to remove and replace Schrader cores without losing charge when drawing oil out of a system during evacuation. Evacuate and charge through an unrestricted line for higher vacuum. Core removal allows recovery unit to work at maximum efficiency, speeding the recovery process. Extra 1/4-in. side port on UPC #18975 lets you attach electronic micron vacuum gauge right at the system for greater accuracy. — YELLOW JACKET® Products Division of Ritchie Engineering Company, Inc. Visit or call 800/769-8370 — Ritchie Engineering, Inc.