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The Goodman 0259M00005 is a genuine OEM gas valve adapter used in the gas train of the Amana/Goodman AMVC80805CNBD variable-speed furnace. This machined fitting bridges the gas valve to the manifold/supply piping with the correct thread pitch and sealing surface, ensuring a leak-free connection during valve service or replacement. It is a threaded adapter component—not a complete gas valve—so it is the right, low-cost part when you only need to correct or replace the connection hardware.
OEM guarantees the exact thread and seat geometry for this furnace's valve and manifold. A generic hardware-store fitting may seal on Teflon tape yet leave a mismatch that leaks under pressure—unacceptable on a gas line. Use the OEM adapter for code-compliant, leak-tight assembly.
Moderate (3/5). Gas work: shut off the supply, use approved pipe dope on threads, and leak-test with soap solution before relighting. If you are not comfortable working on gas piping, have a licensed technician perform the install.