Danfoss Oil nozzle S Le 0.40 GPH 80 degree Oil Burner Nozzle are special versions of the standard Oil Burner Nozzle with a built-in valve. In combination with a Oil Burner pump with Le – Functions (e.g. BFP 21 LE) can be used to stop LE Oil Burner Nozzle Oil Emissions from the nozzle during the heat-up phase of the Oil Pre-warmer and heat reflection after shut off of the burner. Alternatively the LE function can be achieved when used in conjunction with an LE Oil Pre-warmer with built-in LE Valve (FPHB -LE) in combination with an OD Oil Burner Nozzle.