Mechanical thermostats like these are commonly used in air switch controls.
Available in:
275-3123-00 12" Capillary 1/4" X 3.5" Bulb
275-3124-00 36" Capillary 1/4" X 3.5" Bulb
275-2720-00 60" Capillary 1/4" X 3.5" Bulb SPDT (Retro-fit for older Jacuzzi SCM Controls)