Imperial to metric olive - Which way?

[Marcus Jones]

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.

 

[Burger]

Marcus, I think the black alkathene is 22mm, so shouldn’t need imperial olive.

 

[Marcus Jones]

Marcus, I think the black alkathene is 22mm, so shouldn’t need imperial olive.

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.

 

[townfanjon]

It sounds like 20 mm Alkathene, very hard to source them these days , you may have to go phillimac utc

 

[Marcus Jones]

Here are some photos of the olive and 22mm fitting. What is the general consensus on which way it goes into the fitting? Thanks

 

[Marcus Jones]

Here are some photos of the olive and 22mm fitting. What is the general consensus on which way it goes into the fitting? Thanks

View attachment 38424

View attachment 38425

I reckon it should be the bottom pic with the taper going into the fitting.

 

[Harvest Fields]

Marcus, I think the black alkathene is 22mm, so shouldn’t need imperial olive.

If the copper is 1/2” in the flat. A new stop tap will not fit as it will be 15mm

 

[Marcus Jones]

If the copper is 1/2” in the flat. A new stop tap will not fit as it will be 15mm

I know. I’ll be reducing from 22mm to 15mm to connect to the 1/2 inch copper.

 

[Best]

I reckon it should be the bottom pic with the taper going into the fitting.

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

 

[Marcus Jones]

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

Thanks. I know what you mean. It’s on the top floor too!