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This genuine OEM Goodman flowrator inlet tube (part #B1796630) is the factory refrigerant feed tube that connects the metering device (flowrator/piston) to the evaporator coil in ATUF303016AA air handlers and compatible Goodman/Amana coils. It delivers metered refrigerant to the coil for proper expansion. A kinked, corroded, or leaking inlet tube can cause poor cooling, improper superheat/subcooling, or refrigerant loss — this OEM tube restores the correct flow path and fit.
The OEM tube is pre-bent to the correct length and geometry with the proper fittings, so it brazes in without strain on the coil connections. Aftermarket tubing must be cut and formed by hand, risking kinks, leaks, and incorrect routing. For a sealed-system component, OEM is strongly recommended.
Difficult (4/5). This is a sealed-system repair requiring recovery, brazing, evacuation, and recharging — EPA Section 608 certification is required. Not a DIY part; install should be performed by a licensed HVAC technician.