22mm fittings to old 3/4 pipework.

[dfefferkay]

Ey up.

Im looking at a job to replace the old and siezed gate style valves on the cold feed pipework from a CWSC and was wondering if 22mm compression fittings, replacing with full bore lever valves, can be fitted to old pipework or will I need to cut the pipes back and use 22 to 3/4 couplers?

I only ask as I recently Took of the gate valve from my own CWSC and noticed 22mm olives were a little lose around the existing pipework.

Thanks.

 

[Marka1411]

Use 3/4 olives in your 22mm fittings.

 

[kirkgas]

Yes use "green ring" 3/4" x 22mm olives, they aren't all green but are thicker to take up the difference in size

 

[dfefferkay]

Yes use "green ring" 3/4" x 22mm olives, they aren't all green but are thicker to take up the difference in size

Thanks,

If I can only get hold of 3/4 olives will a few wraps of PTFE take up the slack?

 

[kirkgas]

Thanks,

If I can only get hold of 3/4 olives will a few wraps of PTFE take up the slack?

You won't get old 3/4" olives any more, every decent plumbers merchant carries the imperial/metric olives, don't go to the sheds etc

 

[Centralheatking]

Any decent plumbers merchant will have 'green' olives
dont try loads of ptfe I have tried in stress full situations

Its no good- do the job properly CHK

If I can only get hold of 3/4 olives will a few wraps of PTFE take up the slack?[/QUOTE]

 

[MK_Swans]

If you can't get holed of imperial olives then cut back the pipe and get some old to new sockets and convert to 22mm

 

[Ermintrude]

I must have miricale olives mine always work on 3/4 but imperial to metric straights are the daddy or swage you way out of it. Imperial a lot thicker walled so hope u had oats for breakkie

 

[dfefferkay]

Cheers all,

Got a plumbase round the corner so ill try them for the olives on Monday, failing that end feed couplers.

 

[Peat]

Cheers all,

Got a plumbase round the corner so ill try them for the olives on Monday, failing that end feed couplers.

I don't think you'll have much joy with an end feed coupling I've just had similar issues in a bathroom refit connecting onto old pipe work tried a 22mm end feed elbow to join new to old and the solder wouldn't bridge the gap on the old pipe work I ended up using a 22mm speed fit push fitting