Editing Openai/693478c5-5cb0-8013-9c46-dd392ce0d589 (section)

== gpt-5-1-thinking ==
=== User: Cross reference would be great. ===
Cross reference would be great.

=== Assistant: Got it. ===
Got it. For that old Therm-O-Disc 11T-42 / F-125 disc, you’re basically just looking for:
* 3/4" snap-disc thermostat
* Auto reset
* Nominal 125°F calibration (limit or fan control)
* Same switch action (open-on-rise vs close-on-rise)

Here are practical cross-reference families you can actually buy now:

Limit-style (L125, open on rise around 125°F)
* Supco L125-xx series snap-disc limits (e.g. L125-15, L125-20) Amazon<ref>{{cite web|title=Amazon|url=https://www.amazon.com/Supco-Therm-Disc-Limit-Thermostat/dp/B0085B2N1U|publisher=amazon.com|access-date=2025-12-06}}</ref>
* MARS L125-2 (open 125°F, close 105°F) Mars Delivers<ref>{{cite web|title=Mars Delivers|url=https://www.marsdelivers.com/item/39086/Limit-Switch-Open-On-Temp-Rise/|publisher=Mars Delivers|access-date=2025-12-06}}</ref>
* White-Rodgers 3L01-125 (3/4" disc limit series with 125°F calibration) device.report<ref>{{cite web|title=device.report|url=https://device.report/m/dc50c14fdb9d48a2ad104f6b937b085fbbaea713d2e314c35b7296cfc8acfe52|publisher=device.report|access-date=2025-12-06}}</ref>

Fan-delay / fan-control style (F125, close on rise around 125°F)
* Emerson / Therm-O-Disc 36T / 36TX F125-xxF, e.g. - 36TX22-…-F125-25F fan delay (close 125°F, open ~100°F) – sold as Marley/Q-Mark 410074000 F125-25F Fan Delay Carroll Parts<ref>{{cite web|title=Carroll Parts|url=https://carrollparts.com/marley/marley-qmark-berko-parts/marley-fan-delays/y410074000/?srsltid=AfmBOooXtOT5XtRROqCLgh5moAntEUANsQkKl1w31CDMnXqEwb4OKQrc|publisher=Carroll Parts|access-date=2025-12-06}}</ref>

Notes so you don’t get burned (literally or figuratively):
* 11T-42 is just the old Therm-O-Disc thermostat type; modern equivalents are the 36T / 36TX style discs. Accutherm<ref>{{cite web|title=Accutherm|url=https://www.accutherm.com.tw/uploadfiles/851/DOWNLOAD/%E5%AE%89%E8%A6%8F%E8%AA%8D%E8%AD%89%E8%B3%87%E6%96%99/tod-36t-ul.pdf|publisher=accutherm.com.tw|access-date=2025-12-06}}</ref>
* Manufacturers use L125 for limit controls and F125 for fan controls, but the sensing body and mounting are the same; only switch action and differential differ.
* Before choosing the exact replacement, confirm with an ohmmeter whether your original is closed or open at room temp and whether the equipment wants it to open or close on temperature rise. Then match that plus approx 125°F calibration and a similar differential (10–25°F is typical). johnstonesupply.com<ref>{{cite web|title=johnstonesupply.com|url=https://www.johnstonesupply.com/product-view?pID=K34-860|publisher=johnstonesupply.com|access-date=2025-12-06}}</ref>

If you tell me where this came from (equipment model / application and whether it’s limit vs fan), I can narrow that list to a single “grab this one off the truck” number.