Twin Shower Valve install into new shower room

[Dean1896]

Hi All, hope you can all help, ive done a lot of DIY in the past but i have a couple of simples question that i need a plumber to answer if possible.

I have a Twin shower valve that i need to install in a new shower.
It has 3/4” inlets and 1/2” outlets.

Question 1 is what pipes sizes do i need to feed to inlets? 22mm in and 15mm out or is 15mm all round ok?

Question 2 can i use JG Speedfit in the walls or should i use copper for safety?

Thanks for your time, any help would be appreciated.

 

[cross thread]

If it’s mains pressure fed ie combi 15 is ok, no reason that speed fit can’t be used

 

[Madrab]

Is it a concealed valve? Is it compression fittings to fit the feeds to/from the valve?

 

[Dean1896]

If it’s mains pressure fed ie combi 15 is ok, no reason that speed fit can’t be used

Yes its fed from a combi.
Thankyou for spending your time to reply.

 

[Dean1896]

Is it a concealed valve? Is it compression fittings to fit the feeds to/from the valve?

Hi, yes its a consealed valve, the valve itself has 4 inlets/outlets all of which have a 1/2” or3/4” female thread ready for the connection to be connected.

Thankyou for spending your time to reply.