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Old 06-23-2018, 08:23 AM   #1
dkkirkland
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Black tank flush outlet for a 3791RD?

Is there a black tank flush outlet for the 3791D? We don't see one and we've only had this unit about 2 weeks and the black tank still reads 2/3 full when we dump. Our old TT had a seperate hose outles fir that purpose. Thanks

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Old 06-23-2018, 08:32 AM   #2
rslopez65
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As far as adding a signature go to User CP then click on edit signature. There you find a place to add yours. Be sure and check the box to show your signature at the bottom of the reply box.
Our black tank flush is located in the service center. It is labeled. Maybe someone with the same unit can you help you find yours.

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Old 06-23-2018, 08:37 AM   #3
waynemoore
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No there is only one dump line. The tanks are controlled in the convince center. On mine there are two plus one for the black tank and one for the gray (shower) tank. The tank level indicates are useless and never read correctly. We dump,the black tank every 4 or 5 days. We leave the two gray tanks open until a day before we dump the black tank. That provides rice water fir the sewer hose.
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Old 06-23-2018, 11:02 AM   #4
dkkirkland
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Thanks. Doesn't make sense when you spend this much on an RV and they don't provide a way to flush the black tank.
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Old 06-23-2018, 03:09 PM   #5
Mr Pachu
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The black tank flush connector was in the convenience center on my previous 2015 Montana 3790RD.
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Old 06-23-2018, 04:32 PM   #6
Md.FireFighter 3791RD
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In my 2016 3791rd there's three hook ups. One for campground water,one for winterizing and one to hook hose to flush black tank.
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Old 06-23-2018, 05:06 PM   #7
ssgl
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Black tank spray/flush water hose connection is located below the city water connection. Be sure to read the instructions on the left sidewall.
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Old 06-24-2018, 10:08 AM   #8
dkkirkland
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You're right, its there below the city water port. Was thinking that was the fresh water intake port. Thank you everyone.
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Old 06-30-2018, 01:03 PM   #9
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There are 3 pulls. Two in the convinence center and one located under or by the fridge slide. That why you are getting the reading you are getting. I have the same model, purchased about three weeks ago!
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Old 07-05-2018, 06:28 PM   #10
Hobos3
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Black tank flush hook up

Hi ,
Everyone is correct. Your flush line is in the service center. As far as your gauges go. Bite the bullet and install the See Level guages. You would need the system for 4 tanks. I put them on our 2013 3800 RE Big Sky and now we know exactly what’s in the tanks! It’s not exactly fun to do on a Monty since you need to lay under and drop the belly lining. Those factory probes are worthless. We dry camp 10 days before needing to dump.
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Old 07-06-2018, 10:15 AM   #11
jeffba
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The Industry standard probes are there just for entertainment purposes and to fix it so you do not have run new wiring for SeeLevel gauges.
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