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i have a laredo 330rl. we found out that there are TWO gray water tanks. one for the kitchen sink and one for the bathroom sink. we only found this after the kitchen sink would not drain. come to find out that they (keystone) never installed the second handle (which is way under the trailer) so we did not see the gate valve handle. once i crawled under and pulled on a small stud. the sink drained! both lines go into one exit tube so we are thinking about leaving the kitchen sink one always open. Bad QC and design by Keystone
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