These plates are necessary when installing a Carlin EZ-1 oil burner for the first time. Depending on what size nozzle you will be using---this plate will adjust the 'set-back' of your nozzle assembly (J-tube) to the exact factory recommendation. OEM burners MAY already have this plate pre-installed for your application where-as if you are using a Carlin EZ-1 for your own application you will definitely require this assortment of 7 plates.

How it works:
The hole spacing is different on each one of these plates so that the nozzle assembly (J-tube) is moved a different distance from the nose-cone as the nozzle size changes.