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Problem With Dump Valve

My gray water blade valve with cable connector has stopped working in the open position.  Since I have to remove the front panel to make the valve repair I have decided to re-plumb the bay to add a third valve and cam-lock connector for the dump hose.  Question:  What type and size of connector is used to join the gray and black water holding tanks to the three inch ABS piping. On my current set up there is a hose clamp used on each pipe next to its respective tank. Can't really see how the connector is joined to the ABS pipe.  Thanks in advance on your advice and suggestions.
David & Sherry Kendrick
"Gizmo" The Doggy Lama
USAF(Ret) 1971-75; 1979-95 (20 yrs)
2003 U320 F03 [6179] 38PBDS (3/2016)
2016 Chev Silverado Z71 LTZ
Motorcade 17738
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New Horizons 5W 25' RKS (1/2004 - 3/2016)
2003 Chev Silverado 2500HD Duramax
Tent (5-person) White Stag (1972 - 2003)

Re: Problem With Dump Valve

Reply #1 –
Quote from: WagonWheels –
Question:  What type and size of connector is used to join the gray and black water holding tanks to the three inch ABS piping. On my current set up there is a hose clamp used on each pipe next to its respective tank. Can't really see how the connector is joined to the ABS pipe.  Thanks in advance on your advice and suggestions.

Take a look at this thread Steve posted a few days ago, which includes photos and info on the connections to the holding tanks:

Holding Tank Plumbing / Utility Redo

This is the hub fitting he used https://www.amazon.com/dp/B07QX92VWN
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Learn every day, but especially from the experiences of others. It's cheaper!  - John C. Bogle

2000 U320 36' non-slide / WildEBeest Rescue
2003 U320

Re: Problem With Dump Valve

Reply #2 –
Holding Tank Hub Fitting (as above) which inserts into the polyethylene holding tank nipple. 

The hub has an O-Ring to seal but you must use butyl to really seal it, plus the hose clamp.  I used the butyl caulk sold by the hub MFG, probably unnecessary (there many sources for butyl caulk)  but I really don't want that connection to leak.

Enjoy your time in the holding bay !
2000 / 36' / U320 / WTFE
WildEBeest / "Striving to put right what once went wrong"
 

Re: Problem With Dump Valve

Reply #3 –
If you remove the 4 bolts on each valve they will come apart and then just replace the valves. I would not mess with the hubs that go into the tanks. To install a third valve just cut the 3 inch abs pipe on the outside of the panel in the wet bay and get the fittings that you need and a 3 inch Valterra valve.
previous 1984 35 ft ORED 250 HP 3208 Cat       
previous 1998 40 ft U295 CAI 325 hp Cummins
previous 2003 40 Ft u320 build #6140 450 Cummins M11.                                                         
1999 Mazda Miata
Ron, Nancy, Tipper the cat, Max The dog
1997 U 270 36 ft build number 5174 8.3 Cummins