Guys/gals just after a bit of help... getting a bathroom refit and plumber has left me a list of the items I need to purchase as it will be about 4 weeks before he starts..he is on holiday so cant ask him. I am getting a concealed shower valve but looking at the ones I want the description is losing me. one says twin modern square shower valve with one outlet the other says twin square modern shower valve with diverter with two outlet.. the one I am currently using is run off the combi boiler with just a on/off dial and hot/cold dial to set at the desired temp.. any help would be great .. thanks