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30910 is an Elkhart Supply PEXLOCK three-way bypass valve designed for compatible PEX plumbing systems. It features three 1/2-inch connections and is commonly used to redirect water flow around an RV water heater during maintenance or winterization. The PEXLOCK connection system allows installation using ordinary pliers, without a conventional crimping tool. It is suitable for compatible PEX and PERT tubing applications. Verify the plumbing layout and connection requirements before installation.