Black Tank Pipe Seepage

[Mick & Pat]

When you pull the black tank lever to empty is it normal to get a small amount of seepage from the pipe to valve coupling,the one immediately after the open / close valve?

I have changed the pipe coupling but still get a slight leak.

 

[Ned]

If it's leaking from the bayonet fitting on the sewer hose, then just change the bayonet fitting.  The o-ring is probably worn out.  If it's leaking from a cemented joint, then the repair is a bit more difficult.  If it's leaking from the valve assembly, then you can replace the valve.  Not a difficult job as long as you can reach all the bolts.

 

[Mick & Pat]

Ned,
Thanks for your reply, is the 'O' ring on the coupling at the start of the waste pipe or on the black plastic valve?

I replaced the pipe and coupling just a week or two ago, the 'leak' isn't severe and appears to be worse if the flow along the pipe gets restricted by a bend.

 

[Ned]

The o-ring will be in the bayonet fitting that's on the end of the sewer hose.  There are o-ring seals in the valve as well, but to change those you have to remove the entire valve assembly so you might as well replace the entire assembly.  They aren't that expensive.  But if it's the bayonet fitting that's leaking that's an easier and cheaper replacement.