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The WILLIAMS COMFORT PRODUCTS TM-394RSD is a replacement square drive component designed to restore proper mechanical function in compatible Williams heating units. Square drive parts transmit rotational force within the burner or valve assembly, and wear or damage to this component can interrupt normal operation. This part is sold individually and is intended for installation by qualified HVAC or heating equipment service technicians familiar with Williams product lines. At 1.56 pounds, it is a compact, direct-replacement service part suited for field repair work.
The TM-394RSD is used in residential or light commercial heating applications where a worn or damaged square drive must be replaced to return the unit to service. It is specifically referenced as a replacement part for the TM-394 model, making it a direct-fit service component for that unit. Technicians servicing Williams heaters in homes, garages, or small commercial spaces will find this part appropriate for standard repair calls.
Specified as a replacement square drive for the Williams TM-394 heating unit. No additional compatible model numbers were provided in the product data.
Installation should be performed by a licensed HVAC technician or qualified heating equipment service professional. Shut off all electrical power and gas supply to the unit before beginning any service work. Follow the manufacturer service documentation for disassembly and reassembly procedures specific to the TM-394. Verify all connections and fasteners are properly seated before restoring power and gas to the unit.
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