New water main-stop cock and drain valve?

[RockyBalboa]

Installing a new water main with blue 25mm MDPE. The water company state I need a stop cock followed by a drain off valve.

Can I use a plastic stop cock such as:

https://www.toolstation.com/jg-speedfit-mdpe-stop-...

And drain off valve such as:

https://www.screwfix.com/p/jg-speedfit-15mm/12232?...

[RockyBalboa]

The stop cock I posted is a 25 x 15 so the larger end would be for the MDPE and the other end for standard 15mm plastic pipe?

The water company want somethig basically like this:

[RockyBalboa]

Looking on the JG Speedfit website it states:

Connection to Mains Supply

In modern properties, water enters a building usually in a blue MDPE (medium density polyethylene) pipe. In order to comply with Water Regulation Schedule 2.10, the internal plumbing system should be connected via a Speedfit Stop Valve (Part Nos. 15STV and 22STV) in conjunction with a PE-Copper Coupler from the Speedfit range of Underground Fittings.

[RockyBalboa]

That makes sense!

So I'm thinking I need:

1. MDPE pipe
2. Stop Cock 25mm x 22mm
3. Piece of 22m pipe
4. 22 x 22 x 15mm reducing tee
5. Piece of 15mm pipe
6. Drain off valve on 15mm pipe

Does that sound okay?

[RockyBalboa]

jagnet said:

If the tee is for the drain off cock, then I'd just go with a 22x15x15 reducing tee and solder the drain off cock straight into that.

MDPE + pipe insert into 25x22 stop cock
Short length of 22mm pipe
22x15x15 reducing tee + drain off cock
15mm pipe into existing pipework

I'm trying to avoid any soldering at this stage - will the drain off valve push fit on to 22mm pipe?

[RockyBalboa]

Ah yes, my mistake, 22 x 22 x 15mm reducing tee and the drain off valve can go on a bit of 15mm pipe.

[RockyBalboa]

Any particular advantages of brass?

What's the difference between the Poly and DZR:

https://www.toolstation.com/poly-stopcock/p16758

https://www.toolstation.com/dzr-stopcock/p19828

Can I fit it straight to the 25mm MDPE pipe without further fittings?

[RockyBalboa]

Just deciding if I should use 15mm or 22mm plastic for all the runs?

The flat is all electric so will have an instant water heater under the sink and 2 electric showers.

[RockyBalboa]

Sorted it.

Used the brass poly stopcock to connect directly to the 25mm MDPE. Video call with the supplier and it has been passed and can back-fill.


Have done all runs in 22mm JG Speedfit just for belt and braces as it's a shared supply.

[RockyBalboa]

Just FYI to all..

Severn Trent came down today to connect the pipe up to their end. They installed a 'flow meter' which is basically a water meter and say this is now standard practice. I obviously protested and the contractors assured me it won't be used for billing. Rang the team who deals with the installs and they said the same and said it's for the future and then can be activated 'if you want to be billed off it'.

I'm going to split the pipe internally to two flats so a water meter wouldn't work anyway but just a heads up for everyone.