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The Goodman 0259M00005 is a genuine OEM gas valve adapter used to connect the gas valve to the manifold/supply on the ACVC81005CXBC gas furnace and other compatible Goodman and Amana models. This precision fitting ensures the correct thread interface and seating geometry between the gas valve and the burner manifold for a secure, leak-free connection.
This factory OEM adapter is machined to the exact thread and dimensional spec of the Goodman gas valve assembly. Because it carries fuel gas, an exact-fit OEM part is critical — a generic adapter with a slightly different thread or seat can leak. Always pressure/leak-test after installation.
Moderate (3/5). Involves working on the gas supply line. Shut off the gas and power, use appropriate thread sealant rated for gas, and leak-test all joints with soap solution. Recommended for a licensed HVAC technician.