Steve
Next time I'm @ the bus I'll get a picture. It is nothing more than a small VENTED tank that the air box drain tubes are connected. A lot of bus people just use a capped 4" PVC pipe as storage. Causes of excess leakage was due to bad blower seals & or piston rings and especially excess idling ie busses.
This problem is mainly in the GREEN series, not somuch in the later SILVER series.
Walker AirSep makes a kit for it & other diesels.
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Gordon Hummel
1991 41.5' #266
8v92
2009 Pontiac Vibe GT Toad
Fulltime on the road
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