It is, indeed the thermal switch for vacuum advance in a CIS system. It allows vacuum to the distributor during cold start and into warmup. I don't have an exact number for the shut-off point, but I think about 60C ( may depend on model year).

this might be right in case of older or euros

mine does connect to the WUR & a quad with one of the legs being the distributor vacuum...

Both vents broke off
so I connected these 2 lines together by inserting a small piece of tubing until I can get it to the shop

$14.50
good for you
Price has doubled since then...

Still would really like to know what this lil devil really does
or doesn't do when its not working right...

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83 500 SEC Euro 198K