Thermac switch?

[davepl]

I might have the wrong name, as I'm having no luck finding it.

I need the little thermal vacuum switch that goes inside the air cleaner housing and controls the opening of the heat stove flapper valve.

Anyone know what its called and where I can find them? Should be a common service part, you'd think.

Thanks!
Dave

PS: In case anyone ever wonders, I had my Air Cleaner housing powder coated. I was worried that the heat would ruin the return spring and didn't want to take it apart, so risked it. All tests are fine, I've connected vacuum and seen it do its thing and watched it return.

For that matter I had my front coil springs done too, and they're probably more important than the emissions flapper door air cleaner return spring!