Toyota calls it the "vacuum transmitting valve". It may be some sort of a check valve or one-way valve.
Part 23283 in the diagram (Mid-upper-center of the diagram)
Part no.: 90925-01091 - VALVE, VACUUM TRANSMITTING, NO.3
VACUUM PIPING[ (925- )2E ] TOYOTA COROLLA [AE1#,EE1] (ASIA and MIDDLE EAST)
Function and testing:
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