just purchased this Barth and am going thru everything, this canister is in front left storage

it says air something,, cant make out what it says, this is on a 35 ft Regency, 1984 with a 8.2 detroit

That is your windshield washer reservoir. It is powered by compressed air.

well , so simple, lol,,,now i know, now im not so worried about it being dry,,,,thanks

Thank you again Captn. Another one of my question answered!!!

Thank you also Tom K for letting us know.... Also Bob it looks like we have the same coach... The 12 volt configuration in my "Elec" closet is the same as yours except mine has labels on the doors of the fuse panels and the relay panel... It also has wire colors and numbers on those labels.. I will try to get pics for you maybe they are the same and you could use them.. They have already helped me in diagnosing problems and in the decision to purchase the Barth...