The white plastic thingy next to the right of the alda with several vacuum lines going in and out... what does it do? Mine will only hold 10 vacuum and is an aparent vacuum leaker. What vacuum should it hold? Thanks

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Mr Goodfahrt (pronounced FAIRT... means "good trip" in German)

1982 300D Turbo Pastel Gray (off-white) 200k+(?)
newbie but willing