Is a One Time Only use...Put it on and that's it...Take Off and it's destroyed.
(It does allow a Miniscule adjustment once capped,less than 170 degrees)

Someone pointed this out in another post this weekend.

We suppose,you're supposed to make ALL the correct adjustments with the
little Metal "T" handle [Using Pressure Gauges,so you get it absolutely correct]
then apply the "CAP".

Yet another way Mercedes FORCES you to buy new parts.

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'84 300SD sold
124.128