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Imperial to metric olive - Which way?

Discuss Imperial to metric olive - Which way? in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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Marcus Jones

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Hello all. I’m replacing a stop tap which is connected to black alkathene and then feeds the flat in 1/2 inch copper. I’ve bought a 22mm stopcock, along with some imperial to metric olives. These are the ones which taper on the one edge. Which way do these go? Tapered edge INTO the 22mm fitting or the other way round? Thank you.
 
CBW1982 said:
Marcus, I think the black alkathene is 22mm, so shouldn’t need imperial olive.
Click to expand...
Really? Ok. Thanks. I’ll try a couple out once I’ve taken the old stopcock off. It’s in a block of flats that was probably built in the 60s/70s. Just out of interest, are you aware of the tapered/chamfered (one one side) olives that I’m referring to? Logic would suggest that the 2 matching edges (ie 22mm edge into the 22mm stopcock fitting) go together despite this being the opposite way we use rubber tapered washers in plastic compression waste fittings.
 
Here are some photos of the olive and 22mm fitting. What is the general consensus on which way it goes into the fitting? Thanks

A2ACAC3A-34ED-4080-AF8A-0F6B4533F77D.jpeg


2691E159-4868-4A93-8B79-AC8FC3CD3990.jpeg
 
Marcus Jones said:
I reckon it should be the bottom pic with the taper going into the fitting.
Click to expand...

Correct way is the bottom picture with the large taper into the fitting.
If I were you I would be wary of working with the black water pipe - and at flats you could flood a lot of properties.
Be sure to check the pipe has proper liner and that the olive is correct size and compressed into the pipe just right
 
Best said:
Correct way is the bottom picture with the large taper into the fitting.
If I were you I would be wary of working with the black water pipe - and at flats you could flood a lot of properties.
Be sure to check the pipe has proper liner and that the olive is correct size and compressed into the pipe just right
Click to expand...
Thanks. I know what you mean. It’s on the top floor too!
 
Marcus Jones said:
Really? Ok. Thanks. I’ll try a couple out once I’ve taken the old stopcock off. It’s in a block of flats that was probably built in the 60s/70s. Just out of interest, are you aware of the tapered/chamfered (one one side) olives that I’m referring to? Logic would suggest that the 2 matching edges (ie 22mm edge into the 22mm stopcock fitting) go together despite this being the opposite way we use rubber tapered washers in plastic compression waste fittings.
Click to expand...

Yes I knew what you were referring to, I was just replying but realised the time and decided to go home. Yes the tapered edge into the fitting so the 22mm seals at 22 end of nut fitting.
 
Marcus Jones said:
The black pipe is the incoming mains which then reduces down to either 15mm or 1/2 inch copper. Having mulled all this over, I’m considering abandoning the replacement of the stopcock and fitting a new 15mm stopcock further along.
Click to expand...
If you do this and you have 1/2” pipe you will need 2 x old to new connectors and some copper pipe.
 
Stigster said:
I've always found them to be so close in size that the fittings are interchangeable on the 15mm - 1/2". The 22mm - 3/4" are way out so need an adapter but you have problems with the 15 to imperial?
Click to expand...

My experience is as yours Stig.
My take on the images is top. Why? Because the longer taper is far more accommodating of dia. Look at the short end. It is perfectly matched with the olive.
Just my two penneth ;)
 

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