Thermostat
Thermostat means a temperature control device that contains metallic mercury in an ampule attached to a bimetal sensing element, and mercury-containing ampules that have been removed from these temperature control devices in compliance with the requirements of 40 CFR 273.13(2) or 273.33(c)(2).
Source
40 CFR § 260.10
Scoping language
When used in parts 260 through 273 of this chapter, the following terms have the meanings given below: