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the 4th port is plugged and is used for testing,
it should have a double sided green plug with a rib in its center
the system also used two check valves,
one for the booster the big one,
and the the small one .
NOTE the small one takes its feed from the big valve
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^^^ Stan ^^^ 2019 BMW K1250 GS 2016 HD RK
1988 S4 Auto , Elfenbein Perlglanz, Pearl Gray
1982 5sp Met black and tan sport seats
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