What size wrench size is power master pressure switch

N2BUICK

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Joined
May 25, 2001
Trying to help a friend replace PM switch, remotely. I went to vacuum brakes some years ago and forgot what size tool is needed .
Thanks
 
theres kent moore tool for it j-37117
, otherwise use channel lock pliers carefully
doesnt need to be too tight , the oring seals it
 
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