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Third dump valve

All,
In response to a recent PM I am posting the info here for all to benefit.
I did this a while ago and it has worked out well.
I ended up cutting the pipe a couple of times and trial fitting to make sure it was where I wanted it. Remember that when you actually glue the parts together they generally go in a little further. With the standard 45* fitting and hose the door will close no problem as it is shown. I recently bought a clear(transparent) 45* fitting and the door will not close with a hose attached (it closes with just the 45 alone) because the fitting is just a bit longer and designed to connect a hose with a straight fitting on it. As others have mentioned before, the 45* would need to be a little more like 55-60* to clear the door. As it is my valve could be moved inboard about 3/4"-1" and I think the transparent 45 would clear the door but not sure a regular 45* would connect. Just watch out that the third valve does not interfere with the black tank valve. By design there is enough room below the valve to twist the fittings on. The pipe is black ABS so you need the ABS cement and some cleaner solvent. I think I just used some acetone to clean.
If you need more detailed explanation just ask.
Rick
Rick

Re: Third dump valve

Reply #1 –
nicely done. I have had a third valve on all three of my coaches for the last 12 years.
2025 Wanderbox Outpost 32 on F600 Expedition Motorhome
2015 Born Free Royal Splendor on Ford 550 nonslide version  for sale
Former Coaches  covering. 360,000 miles
1999 34 U270
2000 36 U320
2001 42' double slide U320
2018 Jeep Rubicon

Re: Third dump valve

Reply #2 –
I consider this a very important upgrade.  I had a black tank valve fail last summer while on a motorcade.  Jack Bradshaw was willing to do the repair but suggested it would be better to do it at the factory in case something went wrong.  The third valve kept me fully functional until I could get to NAC for the repair.  While in there I had them replace both the black & grey valves.
Audrey & Harvey Nelson
2000 U-320, 40' towing 2014 Jeep Grand Cherokee
nelsonah@ieee.org

Re: Third dump valve

Reply #3 –
Another option is to redo the valve line to get rid of the cable pull valves.  I decided to go this route when my black tank valve broke (I did have the 3rd valve which saved my bacon for sure :o )

Note: The bay has been cleaned up since I took this picture.  Just wanted you to know that :)

Re: Third dump valve

Reply #4 –
Has anyone doing this project used PVC Ball Valves rather than standard Gate Valves?
Coach Build # 5862/40'/2001/U320/Motorcader 17136

Re: Third dump valve

Reply #5 –
Quote from: MemoryRoads –
Has anyone doing this project used PVC Ball Valves rather than standard Gate Valves?

I didn't even know these existed!

3" PVC Ball Valve (Gray Slip) - Amazon.com
GRAINGER APPROVED VENDOR Ball Valve, 3 In, Socket/Threaded, PVC - Ball Valves -

Not sure how the "stuff" in the water would effect the ball valve.

see ya
ken
As an Amazon Associate Foretravel Owners' Forum earns from qualifying purchases.
The selected media item is not currently available.ken & dori hathaway & Big Agnes
🍺1992 U300 GrandVilla WTBI #4150 FOT FBP 2011
✨6V-92TA DDEC Parlor Coach 350HP Series 92
🏁2011 Nissan XTerra Pro-4X

Re: Third dump valve

Reply #6 –
I agree, wouldn't be enough room to install those valves.
 Richard B.
Richard & Betty Bark & Keiko our Golden Doodle
2003 U320T 3820 PBDS
Build # 6215
MC # 16926
2016 Chevrolet Colorado 4X4 diesel

Re: Third dump valve

Reply #7 –
KENHAt, what you showed in photos, were 'union' ball valves.  they can be un-screwed at either end for quick disasembly. 

Next stop at a Lowes or HD, go to the plumbing section and look at PVC Ball Valves.  Cheap, totally reliable.

YES, Ball valves have more length. The Ball /3"?/ and then, some plastic either side for connecting with some PVC pipe..

Not sure of space constraints in this application, but.. consider that.Ball Valves are rarely used on boats anymore because they are considered  problematic.
Just a thought I felt worth asking........... ;)
Coach Build # 5862/40'/2001/U320/Motorcader 17136

Re: Third dump valve

Reply #8 –
MemoryRoads, I like your thinking.  Why not use better quality valves if you have the space.

Quote from: MemoryRoads –
Ball Valves are rarely used on boats anymore because they are considered  problematic.
  So what kind of valves are they using on boats now?
John Fitzgerald
1991 U300 (SAI) Side Aisle Island Bed 40'
Detroit 6V92 with Allison Retarder
Meridian (Boise), Idaho

Re: Third dump valve

Reply #9 –
Rick, I like that installation and have a question.  I'd like to do the same but can't seem to find the complete Valterra valve with the fitting to glue on to the 3" ABS pipe.  Do you have a part number or source for the part? 

Thanks, Chuck
"Not so  long ago we were a nation of risk takers, riding five million pounds of  thrust straight into space."  Joe Gresh
Chuck Pearson
1996 U295
2018 Can Am X3 TurboRS

Re: Third dump valve

Reply #10 –
Hi Chuck,
 I think you would need a pair of 3" slip hubs from Valterra. One mounts on each side of the 3" waste valve. Four bolts hold it together. Removing the bolts allows you to replace/rebuild the waste valve when needed.
Raymond
Raymond & Babette Jordan
1997 U 320
1998 Ford Explorer XLT

Re: Third dump valve

Reply #11 –
Valterra parts for third valve like Rick has.
1-T1009
1-T1005
1-T1003BU
1-T1020-1
The selected media item is not currently available.Bill&Doris 97 U270 36'
University of Parris Island Class of 66
Semper Fi  Build# 5174 MC#17094

Re: Third dump valve

Reply #12 –
Oops!  John Fitz, you caught me!! :)  I misspoke.  I meant GATE VALVES are' no longer used on boats for thru hull fittings'/ Ball Valves ARE. (Gate valves have a higher rate of failure, so ball valves seem to be a safer choice.)

Insurance surveyors will only recommend ball valves.

For maintanance of plumbing lines in my boat, I use white vinegar to fill and soak the lines and toilets with, but this is not really practical in our motorhomes, as the volumes of vinegar would be large to fill a tank to the level of enabling the level of vinegar to reach the top of the Gate Valve for cleaning purposes.../soaking the upper part of the gate valves.

Once a year,...on my boat, I do use a watered down muriatic acid flush.  Let it soak for 10-15 minutes or so, then flush with lots of water.  It removes all build up.  In our motor homes, I do not know if this is a good choice or not, so will not recommend it until I get a better grasp on this subject.
Coach Build # 5862/40'/2001/U320/Motorcader 17136

Re: Third dump valve

Reply #13 –
Quote from: Bill Willett –
Valterra parts for third valve like Rick has.
1-T1009
1-T1005
1-T1003BU
1-T1020-1
Thanks Rick and Bill for the great info..!!! ;D

I better get parts ordered now

Hans
Hans & Marjet
1995 U300 "Ben" (#4719)
3176B Cat,4060HD,Jake
SKP#139131
Motorcade#17579
2006 Honda Element (towed)

Re: Third dump valve

Reply #14 –
Thanks for the parts list Bill, I'm going to get em headed this way.  I've worried about those valves...and the process of dealing with failed ones with full tanks.  Yuck. 

Chuck
"Not so  long ago we were a nation of risk takers, riding five million pounds of  thrust straight into space."  Joe Gresh
Chuck Pearson
1996 U295
2018 Can Am X3 TurboRS

Re: Third dump valve

Reply #15 –
Bill W.
Thanks for digging up the P/N's for everybody. ^.^d
Rick
Rick