the PTFE (Teflon) components are rated for saturated steam applications

It indicates the unit's ability to track electrical frequency

Does this wheel include the mounting set screw

and several competitive cross-references like the Honeywell F100 and Trion Air Bear

Johnson Controls V47AA-1 Regulating Valve R-410A the PTFE (Teflon) components areThe Johnson Controls V47AA 1 is a professional grade, direct acting temperature actuated water regulating valve designed specifically for heating applications in commercial HVACR systems. As the direct cross for V47AA 18, this 2 way modulating valve utilizes a Style 4 remote bulb (11 16" diameter x 3 1 4" length) and a 6 foot capillary to provide precise thermal control. The cast brass body construction features a 3 8" NPT connection with a 1 2" NPT