The tee comes right out. Do you have a white plastic cap or a black rubber cap? The tee on the white plastic doesn't need to be pulled out to turn as the cap has the retaining slots. The black rubber type has to have the tee pulled out just enough to clear the castellations.

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