imperial/metric

[Gordon]

are 1/2" to 15m/m and 3/4" to 22m/m copper pipe adapters available, I have tried B&Q warehouse and Wickes without any luck. Gordon

[Set Square]

1/2" and 15mm pipes are so similar that you can use 15mm compression or solder fittings on 1/2" pipe without any problems. 22mm pipe is *slightly* bigger than 3/4". You can use 22mm compression fittings on 3/4" pipe with special olives - with a slightly smaller ID. You can get these at a decent PM but maybe not at the sheds.

If you want to use solder fittings to join 22mm and 3/4" pipe, you need special fittings whose two ends are a slightly different size. Again, you can get them from a PM - or probably on-line from the likes of BES.

[John Rumm]

Or if needs must, run a pipe cutter round a 22mm fitting once or twice... not enough to cut into it, but enough to put a dent into the circumferance and reduce the diameter enough to solder it! (DAMHIK)

[Andy Luckman (AJL Electronics)]

Compression yes, but I have experienced the odd failure when using 13mm fittings on 12.7mm (1/2") pipe.

[Bob Mannix]

Indeed - if SSq had left off "without any problems" then OK. I have found it necessary on many occasions to abrade (with steel wool) 1/2" pipe down quite a lot to get 15mm solder fittings on. They will go eventually though. If they are too tight a fit then the solder won't flow properly and the joint will be suspect for ever more so it's worth working them to an easy fit.

Bob Mannix

[Set Square]

I'm not sure which pipes you are talking about. Half inch pipe isn't 12.7mm. The 'half-inch' refers to the nominal bore, so that the OD is larger than this - and very close to that of 15mm (not 13mm) pipe.

[Dave Fawthrop]

| In article , Set Square | wrote: | | > 1/2" and 15mm pipes are so similar that you can use 15mm compression or | > solder fittings on 1/2" pipe without any problems. | | Compression yes, but I have experienced the odd failure when using 13mm | fittings on 12.7mm (1/2") pipe.

Yorkshire and other soldered fittings *no*. There used it be special soldered fittings but I doubt they sell them any more. Always use compression fittings to join imperial to metric.

[Bob Mannix]

Too harsh, they (15mm fitting onto 1/2" pipe that is) will go with a bit of effort and quite successfully. Most of my radiators are fitted like this (1/2" installarion converted to 15mm then onto rad).

Yes I bought some not long ago, you can still get them I believe. The 22mm to 3/4" ones are easier to find (as you can't do without) but you can still get the small ones, I believe.

Easier but not better (but that's not an imperial metric thing!)

Bob Mannix

[Dave Plowman (News)]

Last time I tried, I found end feed 1/2 - 15mm and 3/4 - 22mm adaptors at my local PM.

[Andy Luckman (AJL Electronics)]

Yes sorry, I'm in pratt mode.

I have had failures when using 15mm couplings on older 1/2" pipe. I now only use new pipe for everything and have had no failures at all.

SWMBO bought a mixer tap from Ebay. Nice bit of kit. Then you notice French markings for Froid et Chaud. Ne problem, mais. . .

Apparently the French go in for 12mm couplings and flexible hoses the size of a pencil. I managed to get some adapters from Plumb Centre and it is all OK apart from the hot flow, which is slower than I would like.

[Ian_m]

sell end feed 15mm to 1/2" for 21p or solder ring for £1.50 odd. Also 3/4" to 22mm as well. Last one I got from Jayhard (when they existed) a couple of years ago and when I found I was one short on a Sunday, from Homebase of all places for a rip of cost.