Bristan Prism Thermostatic Recessed Dual Shower Valve With 2 integral Stopcocks - Chrome. 15mm inlet connections This shower valve has been designed to fit in any UK wall cavity and therefore only needs a 35mm deep cavity space Fitting depth including plasterboard and tiles is 45mm - 75mm Minimum cold water supply temperature is 4°c Maximum hot water supply temperature is 80°c Fully serviceable from the front Integral twin stopcocks Supplied with wall outlet Metal back plate and handles for added durability