External water feed

[festive]

I volunteered to help my neighbour finish the water feed to their allotment. Would appreciate some thought on how to finish this.

Looks like a hep style 15mm feed from house which runs down wall currently. The channel cut in concrete i guess to run mdpe up to house or join somewhere.
This needs to connect to a 20mm MDPE pipe. Where do you normally terminate 15mm and convert?
I have warned her already this will not be frost proof!

 

[undertrained]

Not only does it need to be frost proof but prevention of undue warming from the sun. Is there adequate backflow prevention inside the property?

 

[festive]

There is a single check valve internal to this pipe if that's what you mean?

 

[undertrained]

There is a single check valve internal to this pipe if that's what you mean?

Yes it is, but as a minimum should be a double check valve. I can't see any sleeving to protect where it exits the wall and also hole goes through the DPC

 

[festive]

No my bad it is double just climbed under and can see as it was facing wall. Re DPC yes i know first thing i commented on but she's not concerned i dont think they will be here much longer bless them. Anyway any thoughts on a quick fix to connect?
I am going to remove the 15mm anyway redrill in 22m add a sleeve and replace this, although the DPM woops.

 

[undertrained]

There are several connections on the market that will allow you to connect from 22 to 20 MDPE, just type into search engine 22mm x 20mm MDPE reducer.