The AllPoints Foodservice Parts & Supplies 221166 is a high-quality infinite switch knob designed for various foodservice equipment. This black knob features clear white numbers for easy readability, measuring 2 inches in diameter. It includes an off-low-2-6-high scale, allowing for precise temperature control. The knob is designed for a .187 mount and features a flat down configuration, ensuring a secure fit. Compatible with American Permanent Ware products, it is suitable for use with the DS-1A hot dog steamer (serial number 9207001 and above) and warmer series models FD, W3, W3V, W4, W43, and W-4. Enhance your equipment's functionality with this reliable replacement part.