When emptying the rear gray tank, it will drain 2/3rds but at 1/3 full it slows down considerably and I hear burbling. When I shut the gray valve it has some time to catch up and will drain again until the lack of airflow slows it down yet again. I'm assuming this is a venting issue. Does anyone know where the vent is? I found one under the outsize sink but removing the vent cap did nothing to ease the suction. Any help would be appreciated.
Thanks,
Kent
Thanks,
Kent