Delavan Nozzle Clean Burn part# 32005. This nozzle is not standard with any Clean Burn burner / furnace model but can be used to adjust for fuel weight variations when not using standard used motor oil. Delavan nozzles are commonly used with a variety of waste oil applications and furnace manufacturers. They are sna - siphon air atomizing nozzles 9-7 The Delavan number stamped on the side of this nozzle is 30609-7.