These are all Flame Detectors and UV Photocells manufactured by Riello.
If you would like to purchase Flame Detectors from other manufacturers, please see this page
Riello Photocell (long) 20132526
Replacement photocell for Riello light oil burners.
Part Number: 20132526
Old part number: 3008646.
Riello Photocell (short) 20132553
Replacement Photocell for Riello light oil burners.
New part number: 20132553.
Old part number: 3007541.