Domestic water T piece plastic in copper out, help sought

[pcatterall]

Noticed there was a bit of a leak on my pressurised system.
Traced this to a section of 15mm copper which looks like someone started to cut and then changed their mind!!
I want to replace this but want to be sure I have the right bits to hand before I start.
The copper pipe comes off an old T piece. The T piece in and out pipes are in 15mm ( about ) clear plastic and fit with compression fittings and olives. The copper pipe which comes out of the side of the T piece appears to fit directly into the T, it is difficult to see exactly how it fits to the T it just seems to be pushed in ( no leaks there though!!)
The boat is circa 1974 and I have not seen this kind of fitting before.
Questions...
1/Does anyone recognise this kind of fitting and can I buy
them?
2/ Can I use a standard 15mm compression T ( i.e will the olives fit and secure the water pipe as well as the copper.

Thanks as always!!
This section comes off a T

 

[saltwater_gypsy]

Get the push on fittings which are good for copper or plastic. The fitting can be in plastic or copper but be warned the copper ones are use once only. B&Q here you come!!!

 

[MoodySabre]

If nothing else is leaking why not cut through the dodgy section of copper pipe and join the ends with a new 15mm copper compression fitting. Don't fix bits that ain't broke.

 

[floatything]

THIS stuff
is just the job for what you want - you can get it from any plumbers' suppliers.

 

[narooma]

Presume from the desciption that the 't' is a compression type, ie,a nut on each leg.
Is there enough play on the damaged copper length to be able to cut off the damaged piece and then push the rest back into the 't'?
If not is there enough length available to be able to cut 4" off?

If the first is an option, undo the nut and cut out the damaged piece. Fit the nut back and then a new olive then push it into the 't' and tighten the nut.
If the second option then cut off 4" of the damaged pipe.
Get either a push fit or compression straight (15mm)and fit a new 4" piece of pipe into it then reassemble as the first senario.

 

[pcatterall]

Thank you gentlemen. I shall take all your advice ( though none of you has identified the odd looking old Tee (( 2 compressions and one push fit))
I will take new Tee piece and some 15mm pipe, I will have to disemble it all as there is no space to work but I may (as suggested ) just be able to de paint and clean the old pipe, shorten it a bit at the hole and join the 2 bits with a new soldered or compression fitting.
Thanks guys!!

 

[pete]

Its a bit difficult to imagine from the description but If you are lucky enough for the plastic pipes to be rigid and 15mm od and roughly 11mm id you must use inserts inside the pipe before using plastic or compression fittings to prevent the pipe crushing.

Plastic plumbing pipes I have used are grey or white to prevent sunlight affecting the water inside.

Unlikely, but with your Tee, has the copper pipe on the branch been soldered into the compression end ?
Pete