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Old 08-01-2018, 10:22 PM   #1
Junior Member
Brand: Thor Motor Coach
Model: Four Winds 26B
State: Oregon
Posts: 11
THOR #11440
Question Leak in Plastic Pipe from Graywater tank to Gate Valve

Hi, All.

This looks like a quick repair, but I want to make sure I'm using the correct material to effect that repair.

My 2017 Four Winds 26B has a pipe leading from the gray water tank, running across the back end of the coach to the gate valves.Right where the 3" portion of the pipe goes over the flange of the tank itself is where it's leaking. So, right where the smaller-diameter pipe enters the larger flange portion of the tank.

Currently, it looks like there's butyl tape or putty sealing (or in this case, NOT sealing) it. I spoke to Thor support, and the tech said it should be PVC cement -- but as I look at it, I'm starting to think he was talking about where the two pipes join, rather than at the flange. I'm happy to use either (butyl or PVC cement - or some other material), but I want to make sure I'm using the correct stuff.

Any idea what should be used there? See photo... (Assuming that I managed to correctly attach the photo...)


Rod Scher is offline   Reply With Quote
Old 08-01-2018, 11:33 PM   #2
Senior Member
Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 1,802
THOR #6411
Thor uses ABS pipe in their drain systems. ABS, commonly known as "all black stuff, but it is a styrene plastic. It is quite rigid and must less suitable to cracking under stress or freeze damage than PVC. It uses a special green solvent glue to attach the fittings to the pipe. There is no pipe prep required with ABS. No purple stuff required. It has a foam core so it is much quieter than PVC.

Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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Old 08-02-2018, 12:23 AM   #3
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16ACE27's Avatar
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 4,338
THOR #7035
No picture in your post. The last guy that had a leaking pipe issue finally broke down and used 3M 5200 and has not complained about it leaking since. So it either worked or he sold the RV.
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
16ACE27 is offline   Reply With Quote

butyl, graywater, pipe, pvc cement

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