Part identification

[Rickardo]

Hi

Newbie here

Can someone please identify the part in the picture

This is connected to the discharge pipe on our hot water cyclinder

There is a small leak form the black part

 

[Aquarius]

Looks like a Hepvo valve. Not sure that black fitting should be used. My guess is an unvented cylinder?

 

[snowhead]

Firstly if it's leaking then unless the boiler is nearby and that waste is also being used for the boiler condensate then there shouldn't be any water in the pipe.
It would suggest there's a problem with the unvented hot water cylinder.

Hepvalve or similar, as above.
The black part is a push fit to threaded adapter.
I'd suspect it's the 22mm painted copper pipe that's leaking where it joins the Black plastic, there will be a small reducer in there.

 

[Rickardo]

It is an unvented cylinder

The engineer came out and replaced several parts on the cylinder including fitting a new expansion vessel as he said there should not be any water in the pipe

He would not look at this as was not covered by the service

Since new parts fitted does not appear to be leaking but needs to be looked at for piece of mind