What plastic pipe system is this and can I fix the broken length with another system?

[MikeSharp01]

Just hove to ar our sons new house and found a leak in the pipe feeding the sink. I have not come across this system anybody know what it is and if I can go along to Screwfix and get some other plastic pipe and fittings to splice a bit in where the leak has happened.

[FarmerN]

Looks like black alkathene pipe ( MDPE),to me, but dont recognise the fitting. If it is, any blue MDPE pipe fitting with addapter to black should work.

Edited November 8 by FarmerN

[Beau]

Could be the old Hep20 fittings.

 

I will look in our odds and ends bin to compare as I think I have some laying about 

[ProDave]

That looks awfully like the cheap and nasty plastic fittings used on a lot of static caravans.  Not seen it used in a domestic setting.  What is the inside and outside diameters of the pipe?

[MikeSharp01]

Outside is 15mm inside about 10.5 brown in colour. 

 

[MikeSharp01]

Just fitted a compression 15mm end cap and that worked so next trick get some hep2 and go from there. 

[FarmerN]

1 hour ago, MikeSharp01 said:

Just fitted a compression 15mm end cap and that worked so next trick get some hep2 and go from there. 

Just make sure you have an internal pipe insert for the compresion fitting.

[MikeSharp01]

41 minutes ago, FarmerN said:

Just make sure you have an internal pipe insert for the compresion fitting.

Yes. I don't, so tomorrow I will get some hep2 inserts. Until then I have done a temp job with some JG speedfit bits I had. 

[Nickfromwales]

[ProDave]

Yes that's what was on a previous static caravan (our first build) and once connected to our mains water, one by one they started bursting.

 

No doubt they were old but it would not encourage me to use that type anywhere myself.

[sharpener]

On 08/11/2025 at 13:58, MikeSharp01 said:

I have not come across this system anybody know what it is and if I can go along to Screwfix and get some other plastic pipe and fittings to splice a bit in

 

I think the original fitting is a Polyplumb from Polypipe, but the pipe itself is not polypipe. May be polybutylene from another source, or alkathene. The rainwater system I inherited had a lot of these fittings in it and I think they are quite good, they can easily be undone by hand yet are very positive when done up. Screwfix used to stock them but didn't the last time I tried. Pipe inserts used to be s/steel but later ones were black plastic which have more flow resistance.