UFH Manifold Fitting Sizes

[paperpaper]

I've had a mouse nibble a plastic UFH pipe. Process of elimination and I know it's 3 loops. It might be 1, 2 or all 3. I have a pressure pump and want to properly test each loop in turn over space of a few days or longer to be really sure which is losing pressure and also to help locate it.

The loops connect to manifold with what I think is called a eurocone fitting.
I can see on one of nuts it has 16x2mm stamped on it and it's definitely 15/16mm plastic pipe.

However, the thread the nut screws onto on the manifold is way bigger than a normal 15mm compression fitting nut - but smaller than a 22mm.

I can see 16x2mm eurocone connectors online but it seems like they're too small from photos.

I need a male end that will connect to the loop that reduces or converts to a normal 15mm fitting I can then connect to my pressure pump.

Any help gratefully received! I'll likely need a mini assortment but trying to avoid blindly buying bits!

 

[Madrab]

A pic or 2 might help

If it's 16mm PEX then it's usually a standard Eurocone compression end that it takes.

 

[paperpaper]

Thanks Rob. I've stuck a picture below.

It seems like it should be 16mm eurocone but the "nut" sizes - the chrome nut on the white pipe - and the thread it screws onto - is way bigger than a 15mm compression fitting.

If I look at a 16mm eurocone to 15mm pipe convertor it looks like it would be too small to take that chrome nut.

The pipe is 15/16mm plastic pipe - JG but we replaced manifold years ago as has no end of issues with leaks on the JG ones.