The Star Mfg PS-Z9181 Black Thermostat Indicator Knob with Red Line is a durable and precise control component designed to regulate temperature settings efficiently on compatible equipment. Featuring a clear red indicator line for easy reading and accurate adjustment, this 2-1/4" diameter knob includes a stop screw/stud and a 0.187" mounting insert for secure installation and reliable... https://partsfe.com/knob2-14-d-for-star-part-ps-z9181