Transition from MDPE

[jpadie]

Hi all

 

I've got buried 22mm mdpe running to a garden room.  To serve a shower, basin and loo.   I'm planning to use 15mm PEX to the shower and loo and 22mm for the shower (and immersion). 

 

Is there a good way to transition from the MDPE to 22mm PEX or copper?  Ideally pushfit or solder.

 

Thanks

Justin

 

 

 

[JohnMo]

Use a stop cock. 

[Conor]

Yeah, brass 25mm to 15mm stock is easiest and cheapest way. Remember reinforcing insert on the MDPE for the compression fitting.

[jpadie]

So do all in 15mm incl the shower?  

 

Or is the suggestion to go from MDPE 20 to PEX 15 then back up to 22mm?  Wouldn't that throttle the flow to the shower?

 

[Conor]

You don't need 22mm for a shower. You can go 25mm MDPE to 22mm copper, then split down to individual 15mm pipes via a small manifold if you wish.

[jpadie]

The MDPE is already in place and 20mm. No choice there as it's been in the ground for a decade (I made a mistake typing 22mm in the first post)

 

So convert down to 15mm for the transition.  Then into a manifold to feed the immersion, shower and low demand separately?