This part is a non original compatible spare part, and the manufacturer's name and part number are for reference only. Please note If there are errors during the installation and replacement of this product, resulting in damage or inability to use our product, we offer a one month refund. Your satisfaction is always our highest pursuit! We accept bulk product orders Product Details 1 timer knob for farberware HF 919B air fryer. This fits a 6mm "D" shaped fryer knob shaft see example picture only. So be sure to look at the pictures and check the size before you order the buyer it is the responsibility of the buyer to check for no returns. These air fryers are great, but the factory knobs break easily, so just slide off the broken one and slide on this new replacement. These fryers come in 2 types of timer shaft Pin type and D type. We sell both types, see our other listings.