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Old 05-15-2022, 07:09 AM   #1
Gulfcoastpwr
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Cougar 355FBS

Im purchasing an Cougar 355FBS. I have a question about the docking station hose connection in bottom right is unmarked. What is it for? At first I thought it was a fresh water tank fill. But the fresh water tank fill is in the rear of the coach.
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Old 05-15-2022, 07:27 AM   #2
chuckster57
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Welcome to the forum

Just had a discussion about that :

https://www.keystoneforums.com/forum...ad.php?t=51452
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Old 05-15-2022, 07:28 AM   #3
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There is another thread, identical question on a similar trailer posted by a different member. Thread located here: https://www.keystoneforums.com/forum...ad.php?t=51452
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Old 05-15-2022, 07:30 AM   #4
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The other thread is mine. I will come back and post here (and in my thread) once I confirm for sure.
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Old 05-16-2022, 04:30 PM   #5
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Well I sent an email to the service manager at the RV dealer where I bought it, and he said "he thinks" it's the port for the rear black water tank. I guess it probably is, but I'm still going to verify with the methods suggested in my thread located in the 5th wheel forum before trusting.

I'll probably know for sure by Friday or Saturday of this week, and will report back to the thread at that time.
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Old 05-18-2022, 06:46 AM   #6
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Probably correct for Your unit but my unit only has one black tank.
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Old 05-18-2022, 01:52 PM   #7
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Quote:
Originally Posted by Gulfcoastpwr View Post
Probably correct for Your unit but my unit only has one black tank.
Are you sure your trailer only has one black tank?????

Looking at the floorplan, there's two toilets separated by at least 15' and on two different levels in the fifth wheel. Additionally, the specs call for 76 gallons of gray capacity (two 38 gallon tanks) and 76 gallons of waste capacity (again, two 38 gallon tanks)....

You might want to do some "snooping around the roadside sewer connections" to verify.....
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Old 05-18-2022, 02:03 PM   #8
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Quote:
Originally Posted by Gulfcoastpwr View Post
Probably correct for Your unit but my unit only has one black tank.

Your trailer will have 2 black tanks I'm reasonably certain. Your first pic shows ports for 2 black tanks. I've not seen them throw in plumbing for an extra black tank that wasn't there. Keystone specs show that you have 76 gallons of grey water storage and 76 gallons of waste (black) storage. That should be 2 tanks of 38 gal. for grey and the same for black. Look around under the bottom edges of the trailer for that 2nd waste dump.

Edit: Looks like John and I had the same thoughts, just took me a while to look over the info and get the post written I guess - dang yard people.
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Old 05-18-2022, 03:40 PM   #9
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On RVUSA it shows only one black tank. Also pictures show only one dump location as well as only two Valves one grey and one black. But I will dig further upon pick up of Unit.
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Old 05-18-2022, 03:52 PM   #10
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Check behind the tires for the discharge with a release valve next to it. At least that's where the 2nd one is on my rig.

Also check the landing screen of the control unit inside the rig. Mine shows every tank and their current fill level. I assume you must have the same/similar.
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Old 05-18-2022, 03:57 PM   #11
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On RVUSA it shows only one black tank. Also pictures show only one dump location as well as only two Valves one grey and one black. But I will dig further upon pick up of Unit.

RV USA will be wrong. You won't have 1 76 gal. grey and 1 76 gal. black.
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Old 05-18-2022, 06:32 PM   #12
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Quote:
Originally Posted by Gulfcoastpwr View Post
On RVUSA it shows only one black tank. Also pictures show only one dump location as well as only two Valves one grey and one black. But I will dig further upon pick up of Unit.
When you go to pick up the trailer, be sure to crawl under it and confirm the tank locations, tank dump valve handles and discuss the RVUSA specifications with the person doing your PDI.
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Old 06-06-2022, 06:54 AM   #13
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Thanks everyone, took delivery and You guys are correct, two black tanks and two grey tanks. Two of the valves are in docking station while two of the valves are under by the frame. Very well hidden actually. Gonna see if I can add some Cable actuated valves to get them into a more accessible location.
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Old 06-06-2022, 07:02 AM   #14
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Quote:
Originally Posted by Gulfcoastpwr View Post
Thanks everyone, took delivery and You guys are correct, two black tanks and two grey tanks. Two of the valves are in docking station while two of the valves are under by the frame. Very well hidden actually. Gonna see if I can add some Cable actuated valves to get them into a more accessible location.
Cable actuated valve bodies are around $85-100. https://www.etrailer.com/RV-Waste-Va...SABEgI9aPD_BwE

Electric actuated valve bodies are around $140 https://www.amazon.com/Barker-24130-...67465778&psc=1

If you're going to rip out the old and put in an easier to access type, you might want to consider the convenience of flipping a switch on the control panel or in the convenience center rather than relocating a pull handle.... Costs a bit more, but how much is convenience worth these days ?????
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