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Old 07-11-2016, 02:14 PM   #11
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Join Date: Mar 2008
Location: Southwest Alabama
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You have one gray tank is for the kitchen, and one for the shower & lavatory.

At any rate you should have a valve for each tank. That way you can empty one tank at a time.

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Old 07-11-2016, 10:00 PM   #12
Join Date: Feb 2016
Posts: 35
Understood. Just wondering if the black tank flush, pictured, does both black tanks. I have another black tank valve under the wheel well, behind the 3rd axle, for the 2nd black tank.

I ran water into the black tank to top it off, before flushing, but didn't notice a change in level for the 2nd black tank. Since I have two "tank check LED read outs", I figured the one in the garage is for the 2nd black tank.

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Old 07-12-2016, 07:34 AM   #13
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Location: Salem, VA
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I have a 425 the rear black tank does not come with a blank tank flush. You would have to fill it from inside

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Old 07-12-2016, 08:10 AM   #14
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Keep in mind that just because you have a panel indicator with "1 fresh, 1 black, and 2 gray" does not necessarily mean you have all 4 of them. FR uses the same indicator panels in many different rigs. For example--mine says what's in the above quote, but I don't actually have a 2nd gray tank. It's just that they didn't use (or don't have) a panel with only 1 gray indicator at the XLR factory.
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Old 07-15-2016, 08:09 PM   #15
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Location: Lexington, NC
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On my 375, 1 gray for kitchen sink, 1 gray for main bathroom shower & sink, 1 black for main bathroom toilet, 1 black/gray combo tank for 1/2 bathroom toilet & sink. The black tank flush is only piped to the main bathroom, but I installed one myself for the 1/2 bath.
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Old 07-16-2016, 07:11 AM   #16
Join Date: Feb 2016
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Care to share how it was done?

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Old 07-18-2016, 08:45 AM   #17
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From my experience and research on my 420amp the black tank flush only flushes the tank in front. There is no tank flush on the rear half bath tank..2016 420amp

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