3/8 copper pipe to 8mm copper pipe

[mac376]

Hi I'm trying to change some radiators in my old heating system. The old pipe is micobore 3/8 and I'm wanting to join 8mm to this. I don't seem to be able to get any compresion fittings to convert any suggestions?

 

[Agile]

I doubt that they are manufactured.

Most plumbers would probably do a bodge solder job which is quite easy on such a small diameter tube.

Tony

 

[chrishutt]

What outside diameter is the "3/8" copper tube?

 

[compheat]

You can buy 10mm to 8mm reducing couplings in both compression and endfeed. but the 8 will go inside the 10 so if you cleanit up ok you can do as Agile say's and solder it without a proper fitting.

 

[Soggy_weetabix]

If its imperial, do what Agile says.

Dave

 

[Agile]

Its obvious to me and most professionals but DIYers might find this helpful.

When doing a bodge solder with a tube in a too large fitting, flare the small tube outwards until it fits tightly into the fitting. This will make a better joint and prevent exvess solder getting inside the central bore.

Ideally use plumbers lead/tin solder if its a heating pipe as it becomes "pasty" if its kept at the right temperature.

Tony