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Old 07-04-2018, 12:17 PM   #21
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1975 31' Sovereign
West Liberty , Kentucky
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We have a member of the Kentucky Airstream whose trailer only had only 1 dump valve. Upon further investigation, it seems that there were some units that were equipped from the factory with a single 70 gal. holding tank for both gray and black water. I would hate to be taking a shower when that tank backed up.
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Old 07-04-2018, 01:28 PM   #22
Dan and Lynda
 
2012 28' International
Bremerton , Washington
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It matters what side the sink is on...

We found the hard way that the side of the trailer that the toilet is on, the sink on that side drains to the black tank. On our 28' Serinity International, all of the drains on the curb side (Port) (lavatory sink and toilet) go to the black tank and all of drains on the street side (Starboard) (kitchen and shower) go to the grey tank.
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Old 07-04-2018, 02:52 PM   #23
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Waco , Texas
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Interestingly, on my 2018 FC 25 FBT, I ran the bath sink for 10mins and raised the Grey tank 5% and the black tank was unchanged. Repeating same action two more times and the results are the same.
This leads me to conclude the bath sinks on some Airstream models do drain into Grey tank.

Also confirmed that shower and galley sink drain into Grey tank.
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Old 07-04-2018, 06:11 PM   #24
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2000 25' Safari
Davidson County , NC Highlands County, FL
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Quote:
Originally Posted by jbknowso View Post
A w warn,
Can you point me to an owners manual for my 69 Sovereign?
My small booklet manual is not as detailed as the one you linked to a FC
Happy 4th!

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Sure
This is a link to the Owners Manual. There is no parts manual online.
https://www.airstream.com/wp-content...-0004.085c.pdf

A couple other interesting docs from the archive:
https://www.airstream.com/wp-content...-0004.085c.pdf
https://www.airstream.com/wp-content...41aa4eaa52.pdf
https://www.airstream.com/wp-content...d62ecbae8c.pdf
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Old 07-04-2018, 06:31 PM   #25
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Quote:
Originally Posted by Air4563 View Post
We have a member of the Kentucky Airstream whose trailer only had only 1 dump valve. Upon further investigation, it seems that there were some units that were equipped from the factory with a single 70 gal. holding tank for both gray and black water. I would hate to be taking a shower when that tank backed up.
If you look at the link I posted to the 1969 trailers in my prior post, those only have one tank. The even show how to dig a hole to dispose of sewerage. Times have changed!
I think 1972 or 1973 were the first years trailers had two tanks.
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Old 07-04-2018, 08:16 PM   #26
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Fort Worth , Texas
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I purposly fill and drain both tanks together. It can be done with a twist on Valterra bayonet aux. valve. That will give you a lot of extra grey water room. Just watch the toilet for final usable capacity.
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Old 07-04-2018, 10:27 PM   #27
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2007 27' Safari FB SE
Rancho Murieta , California
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WMB,
I do not see your model / year posted. Please post. If I missed it, I’m sorry.
This topic has me intrigued.
Thx,
Ron
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Old 07-04-2018, 10:49 PM   #28
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1991 34' Excella
Houston , Texas
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Quote:
Originally Posted by The Cralls View Post
We found the hard way that the side of the trailer that the toilet is on, the sink on that side drains to the black tank. On our 28' Serinity International, all of the drains on the curb side (Port) (lavatory sink and toilet) go to the black tank and all of drains on the street side (Starboard) (kitchen and shower) go to the grey tank.


You have your port and starboard mixed up. The curbside is the starboard side. Assume you are sitting in the tow vehicle where you drive on the right side of the road like the US. The side on your right is the starboard and also the curbside.
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Old 07-04-2018, 11:04 PM   #29
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Austin , Texas
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Quote:
Originally Posted by Ronman View Post
WMB,
I do not see your model / year posted. Please post. If I missed it, I’m sorry.
This topic has me intrigued.
Thx,
Ron
It's a 2014 Flying Cloud 25
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Old 07-04-2018, 11:15 PM   #30
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2017 25' Flying Cloud
Waco , Texas
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One thing I do know, Airstream manuals are poorly written and often contain inaccurate information on my FC 25FB trailer. My electrical diagram is from 2007 despite many obvious changes, and my plumbing schematic from 2001 are both wrong for my specific model.

Thank God this Airstream Forums exist, or I would be lost making repairs and improvements to my AS.

Owners helping owners.
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Old 07-05-2018, 06:58 AM   #31
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Somerset , New Jersey
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After reading this and many other (some lengthy) postings here on the forum I have learned a lot about many different Airstreams and, yes, even a little about my own. But one thing I have confirmed that relates to all of them.
We now know just where ASSUME ing anything will get us, eventually.
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Old 07-05-2018, 10:36 PM   #32
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Thanks!
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Old 07-11-2018, 11:03 AM   #33
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2007 27' Safari FB SE
La Pine , Oregon
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I put a deposit on a 2018 27FB and it appears the bathroom sink drains into the black tank on that model (my 2007 Safari 27FB bathroom sink drains into the gray water tank). I was considering a 30 but after watching the Wandering Wagner's and their comment about their bathroom sink draining into the black water tank, I nixed that idea. It's absurd to me that they would drain the bathroom sink into the black water tank and not the gray water tank.
Draining the bathroom sink into the black tank is a major issue for me as, for example I'm at an RV park that doesn't have a sewer hookup at my site. The owner hauls a tote over here to empty my black tank, which lasts me almost a month. This setup with the bathroom sink emptying into the black tank would really put the kibosh on any long-term boondocking. I plan to move to property that doesn't have any sewer/septic for a few months and was going to purchase a tote so I could haul the contents to the sewer dump.
Emptying the bathroom sink into the black water tank is going to dramatically cut back on how long I can go without having to dump my tank, which causes me to reconsider going through with the purchase of the new trailer.
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Old 07-11-2018, 12:00 PM   #34
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Common in quite a few motorhomes and fivers too
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Old 07-11-2018, 12:37 PM   #35
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If I am reading this diagram accurately the ‘18 Classic drains the lavatory into the

grey tank. Click image for larger version

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Old 07-11-2018, 12:46 PM   #36
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2007 25' International CCD FB
2006 23' Safari SE
Grand Junction , Colorado
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If the galley and shower are on the same side the bathroom sink flows into the black tank. That is the way it is on my 2018 25RB FC.
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Old 07-11-2018, 01:23 PM   #37
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Instead of flipping through my manual for a vague answer, I just took 5 min. to go out and test it for myself.
Opened up the valves on my empty gray water tank, turned on the water pump and bathroom sink, and voila...out came the water.
On my 31' 1976 Sovereign International with a rear bathroom, the sink drains to the gray tank.
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Old 07-11-2018, 03:15 PM   #38
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I have a 2018 Int. RB and the bathroom sink drains into the black tank. We are currently are using a composting toilet so its not an issue.
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Old 07-11-2018, 03:38 PM   #39
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2012 23' FB International
Woodstock , Ontario
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I routinely dump my dish water tub down the toilet because as a single I don't fill the BW Tank as fast as the Grey. So for me, the bathroom sink into black water makes a lot of sense.
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Old 07-11-2018, 04:14 PM   #40
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Quote:
Originally Posted by Sophiehaus View Post
If the galley and shower are on the same side the bathroom sink flows into the black tank. That is the way it is on my 2018 25RB FC.
On my 2018 25FB FC, the bathroom sink definitely goes to grey tank. Confirmed.
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