So I finally decided to pull out old Tstat and install my Reisch 170. Is anybody able to tell me if the one on the right in the Google Drive link below is the OEM? It is marked "54mm", "USA" on top and "X", "STC" on the bottom. The new one is marked "56mm", "USA" on top and only "STC" on bottom. The old seems to be a little loose in the housing compared to the new one fit perfect, maybe that explains the 54 VS 56mm?
https://drive.google.com/open?id=0ByPslytANOi9cXFva0F2M0stVGs
Thanks in advance!
https://drive.google.com/open?id=0ByPslytANOi9cXFva0F2M0stVGs
Thanks in advance!