I left my laptop at work so I can't give you a number right now but I can give you their proper name. They are vacuum microswitches. The term switchover valve refers to a vacuum switch that is electrical solenoid operated. Such as the one that is involved with overboost protection on turbos.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician