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Old 05-03-2017, 04:13 PM   #1
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Sierra 397 MKOK black water issue

Hi there
I have a 2017 Forest River Seirra 387 MKOK . Does anyone know about the black tanks 1 and 2.
I can't get the black tank to drain. Help me please.
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Old 05-05-2017, 07:03 AM   #2
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On my 2016 there are the black and gray pull handles at the control center. There are three other handles on the frame rail at the back over the drain pipe. Make sure they are closed before removing the cap. My dealer left them open for me!
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Old 05-05-2017, 07:51 AM   #3
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Do you also have a 387 MKOK

I can't get the back bathroom to drain.
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Old 05-05-2017, 07:54 AM   #4
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I do. There are two gray and one black handle at the rear of the trailer on the frame rail. You have to look under the side and you will see it. I believe it is the galley gray, rear bath black, and the gray for the rear bath. I think the outside kitchen sink is tied into one of those as well
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Old 05-05-2017, 07:55 AM   #5
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5 holding tanks total. It is nice on long trips but takes forever at the dump stations
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Old 05-05-2017, 08:04 AM   #6
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Okay I'll check that. You have helped so much. The dealer and Forst River said they didn't know.
If I can't find it can I message you and perhaps send a pic of what I have
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Old 05-05-2017, 08:23 AM   #7
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Click image for larger version

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Here you go. This is behind the tires on the side with the drains.
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Old 05-05-2017, 08:30 AM   #8
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Thank you
I'll look at mine today. I hope this fixes it.
I really appreciate your help!
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Old 05-07-2017, 07:50 AM   #9
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Thank you so much! I found the levers for the black 2 and the galley and grey 2 because of your help. I so appreciate it. I've been trying to get answers fur over 2 weeks from camping world and forest River and you saved me from having to pull it back for hours.
Thank you again!
Jenny
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Old 05-07-2017, 11:28 AM   #10
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The outdoor kitchen on our 381RBOK is tied to the rear gray. When the kids fill that tank taking bathes it backs up out there too.
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2011 Ford F350 Lariat
2016 Sandpiper 381RBOK with an extremely CRAPPY A/C!!!
Nights Camped: 2010 = 14/11 = 27/12 = 13/13 = 10/14 = 30/15 = 47/16 = 30/17 = 21/18 = 11
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