Rockwood drain valve locations

lbrjet wrote:
We have a front kitchen, bath 2/3rds of the way back towards the rear and one common drain just past the rear axle. Our two grey tanks are somehow plumbed together. Sometimes you get lucky.

That is the ideal gray tank set up in a TT.

lbrjet wrote:
We have a front kitchen, bath 2/3rds of the way back towards the rear and one common drain just past the rear axle. Our two grey tanks are somehow plumbed together. Sometimes you get lucky.

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You basically have the same floorplan as the Windjammer 3008W except the front V nose. The Windjammer has two separate drain valves about 15 feet apart????
Oh well.

We have a front kitchen, bath 2/3rds of the way back towards the rear and one common drain just past the rear axle. Our two grey tanks are somehow plumbed together. Sometimes you get lucky.

BillB800si wrote:

PawPaw_n_Gram wrote:
Because RVs have very limited room under the floor - it often isn't feasible to drain a sink into the same grey water tank as the bathroom shower.
With a front kitchen and mid-rear bathroom - the 3008W has a 38 gallon black tank and a 38 gallon grey tank at the back. This has to be the primary drain location because the black tank has to have the 4" diameter outlet pipe. The kitchen has a 38 gallon tank. There simply isn't enough rise/ fall to run the drain from the kitchen sink to the rear grey water tank.
The 8310SS has the same issue - the rear kitchen sink is too far from the bathroom for using one grey tank. It also has two 38 gallon grey tanks and one 38 gallon black tank..

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Except our 2006 32 foot Jayco Eagle 322FKS we had, had a front kitchen and a mid bathroom with only one drain outlet.
Just saying..... :)

Kinda depends on which side of ax;es waste tanks are.....
All in front or back can use a drain header
Tank(s) front and aft of axles make it harder to use one common drain header

PawPaw_n_Gram wrote:
Because RVs have very limited room under the floor - it often isn't feasible to drain a sink into the same grey water tank as the bathroom shower.
With a front kitchen and mid-rear bathroom - the 3008W has a 38 gallon black tank and a 38 gallon grey tank at the back. This has to be the primary drain location because the black tank has to have the 4" diameter outlet pipe. The kitchen has a 38 gallon tank. There simply isn't enough rise/ fall to run the drain from the kitchen sink to the rear grey water tank.
The 8310SS has the same issue - the rear kitchen sink is too far from the bathroom for using one grey tank. It also has two 38 gallon grey tanks and one 38 gallon black tank..

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Except our 2006 32 foot Jayco Eagle 322FKS we had, had a front kitchen and a mid bathroom with only one drain outlet.
Just saying..... :)

Because RVs have very limited room under the floor - it often isn't feasible to drain a sink into the same grey water tank as the bathroom shower.

If the RV has two bathrooms - there have to be two black water tanks.

With a front kitchen and mid-rear bathroom - the 3008W has a 38 gallon black tank and a 38 gallon grey tank at the back. This has to be the primary drain location because the black tank has to have the 4" diameter outlet pipe. The kitchen has a 38 gallon tank. There simply isn't enough rise/ fall to run the drain from the kitchen sink to the rear grey water tank.

The 8310SS has the same issue - the rear kitchen sink is too far from the bathroom for using one grey tank. It also has two 38 gallon grey tanks and one 38 gallon black tank.

Perhaps if manufacturers would take an extra four inches and run a drain pipe inside a sidewall. That would work with the 8310SS if the door was moved forward about three feet.

Would have to eliminate the slides to make it work in the 3008W.

handye9 wrote:
One of those two valves, works exactly the same as a trailer with only one dump valve. It has one pull handle for the black tank, and one pull handle for the grey tank. The other dump valve, has one pull handle for dumping the galley tank.
There are "Y" fittings that can be used to connect everything into one dump hose.
My trailer is set up this way. One 38 gallon black tank, and two 38 gallon grey tanks.

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Oh I understand the idea. It's just a pain in the butt to crawl around under the slides to dump. Plus I have to get a above ground sewer hose support for the cross over and one to the ground sewer connection. All because someone can't design a proper- simple main dump vale assembly.
And talking about designs- keystone Cougar Xlite trailers this year came out with a no walk on roof and the ladder is no longer available. They even removed the wall supports so that the dealer can't install a ladder.
Happy trails,

One of those two valves, works exactly the same as a trailer with only one dump valve. It has one pull handle for the black tank, and one pull handle for the grey tank. The other dump valve, has one pull handle for dumping the galley tank.

There are "Y" fittings that can be used to connect everything into one dump hose.

My trailer is set up this way. One 38 gallon black tank, and two 38 gallon grey tanks.

Just get some connectors and extra hose and make the two connections feed one dump pipe.

But, I sure do wish that TT makers would start installing Cassette toilets in the trailers. So much nicer than a huge black tank!

Thanks!

Jeremiah