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Old 06-02-2019, 12:44 PM   #6
javelin
Senior Member
 
Brand: Thor Motor Coach
Model: 2013 ACE 30.1
State: Alberta
Posts: 1,410
THOR #2631
It looks like your coach uses the Lasalle Bristol dual rotating gate valve (picture attached) which includes the black and grey gate valves in one unit. This damage usually happens because many grey tanks are slow to drain completely and folks close the grey blade valve thinking the tank is empty when it is not. I find it better to leave the grey valve open over Winter (after initial draining – even when using pink antifreeze in the coach) and leave a tray under the 3” drain (uncapped) to catch any leftover grey water that may still drain over time. Black valve stays closed after draining and is usually not a problem (especially with pink antifreeze in the tank).
Doing an ABS pipe repair is possible, but tricky. If you have not done ABS plumbing before you may want to try the patching tape suggested by others (depending on where the crack is) or take the coach in for repair.
If the grey tank side of the gate valve is cracked (or it is glued to a cracked piece of ABS, only a new Bristol flange will fit......(valterra valve flanges will not work). So if you need just that 1 1/2” side part you probably will have to purchase the whole Bristol fitting (not hugely expensive but might be a little harder to find). The good part of that is you get new grey and black gate valves as spares. The hardest part of the ABS repair is that once glue is applied you have literally seconds to join the pipes in correct orientation and it is critical that the two halves of the grey side gate valve align or the gate valve itself can leak.
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