Fluorescent barrel style starter FS-22 for use with the following:14 watt - 15 inch lamp tubes15 watt - 18 inch lamp tubes20 watt - 24 inch lamp tubesWhen replacing be sure to match FS-22 with recommended lamps, Replacing a starter is recommended if lamp tube is not completely lit or tube continues to flicker, If tube is discolored on the ends, then replace the tube, SKU: RPS19020