Delavan 3.50GPH, 60W (7) nozzle

The Delavan 3.50GPH, 60W (7) nozzle is listed under catalogue article 345.892.035 and manufacturer codes 00350-60W7, 3042178, and 345.892.035. It belongs to the category of oil nozzles for burners. Parts of this type are precision consumables that atomise fuel oil into a fine spray cone, enabling complete combustion. The flow rating (3.50 GPH in this case) is referenced to a standard test pressure; the spray angle and pattern (hollow, solid, or semi-solid) together determine how the flame sits relative to the combustion head. For any replacement, all three parameters—flow rate, angle, and pattern—must match the burner data plate. A nozzle with the correct flow but a mismatched pattern can cause sooting, flame pulsation, or unstable ignition. The 60W designation and the (7) code likely refer to the spray angle and pattern or thread type, but no further decoding is available from the data supplied. When sourcing a replacement, verify the existing nozzle’s marking against the burner specification. Nozzles are installed in the oil pump line, typically upstream of the solenoid valve and preheater in systems that use them.