Where can I get whatever this olive is called?

[Last Plumber]

I've also noticed that plenty of 15mm pipe is a struggle to get into plenty of 15mm fittings anyway these day presumably due to cheaper production.

The fittings are cheaper and crapper than they used to be. Everything is cheaper and crapper than it used to be.

 

[Last Plumber]

I had one in the garage pm me your address i will post it to you. Cheers kop

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That just proves it’s worth keeping everything. It might come in.....you never know.... and here is a perfect example, well done KOP

 

[WaterTight]

I had one in the garage pm me your address i will post it to you. Cheers kop

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Oh mate, you legend! Will do, many thanks

 

[WaterTight]

I had one in the garage pm me your address i will post it to you. Cheers kop

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Oh mate, you legend! Will do, many thanks

 

[WaterTight]

1/2” inside diameter gave (I think, don’t quote me), something like 15.8 mm. outside diameter. There about, roughly.

I'm afraid I have quoted you...
Shouldn't this give 15mm an even greater o/d?

 

[Ric2013]

15mm tube has 15mm O/D precisely.
1/2" tube has an O/D of greater than 15mm.
As others have said.
The key point is that 1/2" tube is probably 1/2" nominal bore.

 

[Last Plumber]

I'm afraid I have quoted you...
Shouldn't this give 15mm an even greater o/d?

Metric tube is made to outside diameter.

 

[WaterTight]

Ah that makes sense then.

Does that only apply to copper? Because I may have got wrong idea due to discussion about push fit inserts/fittings where the bottom line seemed to be you could you use any insert on any plastic pipe as they were all 15mm internal bore but had to use right fitting for right brand as they varied on o/d.

 

[Last Plumber]

I don’t use push fit but the o.d. Will be 15mm on all. Some may have a very slight difference on wall thickness and you may find that some sleeves are slacker than others, you should really use the sleeve that was made for the tube you use. I’m pretty sure any warranty from tube manufacturers only stands if you use the correct fittings too!

I may be wrong there. Others who use the stuff will know more.

 

[Best]

I also don't use push fit plastic plumbing, but am sure that you must use the proper inserts for the plastic pipe as it is the internal bore than can vary slightly.
I probably also have some of those tapered copper olives. The nut for them will be flat inside to hit against olive.
Anyone needing to connect to imperial 1/2" or 1" copper pipe should carry a few Conex brass fittings, because they are a slacker fit, both the fitting body and nut, as well as better quality than the cheap brass we have now. Useful also if a pipe has been expanded slightly if ice damaged.