Connecting 8mm pipe to TRV radiator

[molsen]

Hello!

I am having leakage problems with reconnecting a
trv radiator, using 8mm microbore piping. I have renewed part of the piping and get severe leakage out of the bottom of the connection when reconnecting the pipe into the radiator.

Before I connected I put the radiator nut firstly on the pipe, then a brass "reducer"? washer, then an 8mm olive onto the top of the pipe. I pushed all of this into the radiator, firstly using plenty of ptfe tape around the thread. I then screwed it all in.

I then recharged the system. The leak occurs directly out of the bottom of the fitting and is quite severe. Am I missing something? I did use an old olive to begin with, which looked ok but I am not sure if this is the problem (although I suspect it may be). I have bought some new olives and I am just about to embark upon a refitting, but in order to avoid a repeat of the ensuing flood I would be grateful for any advice!

Is the nut, the brass reducer and the olive all I need? I keep thinking I am missing a piece!

Many thanks

Mark Olsen

 

[sime10]

Easier to get 8 mm rad valves I don't like reducing sets

 

[holty]

if im reading this correctly then when you say youve put ptfe on the thread. dont put ptfe on the compresion joint thread try putting it on the olive 2-3 turns will do, because all you is doing is stoping the nut from crushing against the olive and water passing over it.

 

[scatmanjohn]

What sort of reducer are you using.

The ones i use don't require an olive.

 

[molsen]

What sort of reducer are you using.

The ones i use don't require an olive.

Thanks for the reply Scatman. I managed to suss it out. I used two brass reducers, with an 8mm olive in between. Worked a treat!

Cheers

Mark