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Old 06-29-2015, 08:31 PM   #11
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Hello Sand,

Welcome.

Unfortunately the only way to accomplish your goal is to hard plum the grey discharge pipe to the large 3" black discharge pipe. You will need to do this behind your large black valve.

What many of us have done is screw a 1 1/2" to 3" expander PVC pipe to the 1/ 1/2" grey discharge pipe. What this enables us to do is disconnect the rhino hose from the black 3" connection and then put the sewer hose on the grey adapter. Then you pull the grey and it cleans the hose and flushes the grey.

Not the best solution but a pretty good workaround if you do not want to start cutting into your existing PVC.

There are threads on here that show the adapter we made.

Vin.
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Old 06-29-2015, 08:33 PM   #12
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Try looking this thread over.

Grey drain outlet setup

Vin.
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Old 06-29-2015, 08:47 PM   #13
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Quote:
Originally Posted by Sand D View Post
I have a HW296.
Any suggestions for attaching the gray water drainage to the sewer drainage, so that you don't have to keep switching out at the campsite.
Sand D - I may be the only one that's confused, but please clarify what you're trying to do. It's not a good idea to cross connect the black and gray tanks, you'll end up with crappy water in both tanks. Let us know a little more about what you mean by "switching out at the campsite".
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Old 06-29-2015, 08:48 PM   #14
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The whole point of cutting into the existing pvc is to eliminate having to carry other hoses, connections and hooking stuff up every time you want to dump. Just do it one time and it's finished. Mine has worked flawlessly for over 3 yrs and I only carry hoses for hooking up to the cg sewer.
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Old 06-29-2015, 09:02 PM   #15
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Quote:
Originally Posted by wbdavey View Post
Sand D - I may be the only one that's confused, but please clarify what you're trying to do. It's not a good idea to cross connect the black and gray tanks, you'll end up with crappy water in both tanks. Let us know a little more about what you mean by "switching out at the campsite".
That is a good point that needs to be expanded.

If you contemplate doing as OldCoot suggests, then you need to make sure that each tank is separated by a cutoff blade valve so that the contents from individual tanks do not mix.'

This may have been obvious but I just wanted to make that clear.

Vin.
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Old 06-29-2015, 09:11 PM   #16
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All 3 tanks have their own shut off valves. The black tank and grey tanks have the factory valves and I added one to the galley tank. Each tank can empty individually. There is no cross contamination even tho' I really see no real alarm even if there was.
As for the switching out, before I made the change, I would have to switch the slinky from the black/grey tank to the galley tank which is under the slide. Now I can dump individually, 2 at a time or all 3 at once without moving the slinky.
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Old 06-30-2015, 08:29 AM   #17
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It is very simple to replace the black tank valve with a dual valve
and run a short pipe from the gray tank valve location to the new valve.

see my post about what I did here:
HW296 plumbing MOD

only used once this year but it worked great. pull the lever for the black,
then pull the lever for the grey to rinse the Rhino. One hook-up and one
size hose. And no cross contamination. Mod was less than $50 and took
about 45 minutes start to finish.

here is a link to the valve I bought from amazon:

Robot Check
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Old 07-12-2015, 01:26 AM   #18
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Quote:
Originally Posted by 2gwright View Post
It is very simple to replace the black tank valve with a dual valve
and run a short pipe from the gray tank valve location to the new valve.

see my post about what I did here:
HW296 plumbing MOD

only used once this year but it worked great. pull the lever for the black,
then pull the lever for the grey to rinse the Rhino. One hook-up and one
size hose. And no cross contamination. Mod was less than $50 and took
about 45 minutes start to finish.

here is a link to the valve I bought from amazon:

Robot Check
Literally THE BEST way to do it. It took roughly 2 hours to do everything from start to finish, including getting the stuff at the store. Valve cost 40 from amazon and about 15 in glue and pipe from home depot. Went together smoothly and doesn't leak. This allows you to rinse out the sewer line after each black water drain. It also allows black and grey water to be totally separate systems.
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