Yes, One tool works on 2 sizes of Schrader velves! Comapatable with All refrigeration systems. FEATURES: Remove and install valve core in the charged system, R410a systems included. Replace Leaking valve cores quickly and easily. work on service Schrader valve cores of booth 1/4 " and 5/16" service ports. Stainless steel ball valve to close the port when the core is removed. Durable, solid brass tool has a ball valve that can be opened or closed in just a quart-turn. Solid Forged Brass/Steel construction?designed solid and to last. A side port: 1/4 flair cored, for checking if the job done right, and do other services when the system core is removed. valve cores available at: http://viot.us/otherp.php?other=Plumbs&model=VCores,
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