Beckett part #213U-HD-3B-14 Oil Burner Nozzle Adapter-1/4″ NPT x 9/16″-24 TPI
ONE Nozzle Adapter #213U. (nozzle end 9/16″ x 24 TPI) practically insures that there will be no leakage of fuel between the nozzle adapter threads and the nozzle threads! burner nozzles (with a 9/16″-24TPI nozzle thread)—–>>>>>>.