Resideo 390686-4/U 0.018 in Orifice for Natural Gas, Stamped BCR18

Item #: HONE-390686-4/U
Mfr. part #: 390686-4/U
UPC: 085267028622

$4.19

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Installation by a licensed gas technician is required. Confirm the part against your appliance's parts list.

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Brand	Resideo
Manufacturer part #	390686-4/U
Application	Pilot Orifice
Used With	Q380, Q314, Q327, Q345, Q362, Q379, Q3450, Q3451, Q3452, Q373, and Q308
Includes	BCR18 Orifice
Type of Gas	Natural
Orifice	BCR18 (0.018 in.)
UPC	085267028622

Pilot orifice from Resideo (Honeywell Home), 0.018 in, for natural gas, stamped BCR18, part number 390686-4/U.

The pilot orifice meters the gas to the pilot flame. It is the smallest hole in the appliance and the one most easily blocked, and it is sized for one fuel only.

Getting it wrong is not subtle. An LP orifice on natural gas starves the pilot and the thermocouple cools; a natural gas orifice on LP gives a large, lifting, sooting flame. The stamped code is what identifies it once it is out of the packet.