Help with gray tank knife valve connection
I am having trouble with a gray water tank valve. Last night water was running under the trailer. I removed the black plastic belly cover, wet insulation and found that the knife valve connection wa...
Forum Discussion
ABS won't adhere to poly. The industry uses some type of adhesive but not sure what is is.
Of the two I currently have one has an outlet nipple heat welded to the tank and the other a rubber flange/grommet that is sealed with a flexible sealer and press fit into the opening.
The vent pipes on our 5thW are only pushed into the rubber flange as they want it to move with expansion. Obviously yours isn't just a vent so it needs to be sealed/clamped.
Both the poly nipples and the rubber grommets I have seen were sized exactly to the size of the ABS DWV pipe.
You mentioned gluing the valve to the pipe. Normally the valve is mounted with 4 screws and nuts in between two valve mounting flanges. Only the mounting flange is glued to the pipes.
You might post a picture. Some one on the forum has probably repaired one that's similar. Ask your local rv shop what they use.
Of the two I currently have one has an outlet nipple heat welded to the tank and the other a rubber flange/grommet that is sealed with a flexible sealer and press fit into the opening.
The vent pipes on our 5thW are only pushed into the rubber flange as they want it to move with expansion. Obviously yours isn't just a vent so it needs to be sealed/clamped.
Both the poly nipples and the rubber grommets I have seen were sized exactly to the size of the ABS DWV pipe.
You mentioned gluing the valve to the pipe. Normally the valve is mounted with 4 screws and nuts in between two valve mounting flanges. Only the mounting flange is glued to the pipes.
You might post a picture. Some one on the forum has probably repaired one that's similar. Ask your local rv shop what they use.
