Raypak 53/ELS/53A/55A/105A/105B/151/153 Thermostat Knob {Black] (006885F) elbows PresAir Trol FF switch with

PresAir Trol FF switch with center spout and blue cam

1-1/2 inch MPT x 1-1/2 inch slip design

and this Pasco Specialty version is sized for 2 inch applications using the 3244 reference

Matching the correct overlay style helps preserve intended control clarity

Raypak 53/ELS/53A/55A/105A/105B/151/153 Thermostat Knob {Black] (006885F) elbows PresAir Trol FF switch withThe Raypak thermostat knob is designed for compatible 53, ELS, 53A, 55A, 105A, 105B, 151, and 153 heater applications where the supported user adjustment control needs replacement. A thermostat knob is useful because it gives the user a direct way to change settings, making day to day heater operation easier and more intuitive. This replacement is especially useful when the original knob is cracked, missing, loose, or no longer turning properly.