This Bristan Shower Valve Adjustable Pipe Centres - Adjustable Elbows Meaning this shower will replaceshowers with older 110mm centres, 130mm centres as well as the industry standard 150mm...any anything inbetween! Bristan Rio Thermostatic Surface Mounted Shower Valve with Adjustable Riser Chrome - 15mm inlet connections. Easy replacement with adjustable inlets so you can use on existing pipework centres between 110mm and 155mm. Thermostatic cartridge with preset temperature stop at 42°C. TMV2 thermostatic control for a higher level of performance and protection. Supplied with 1 x 7L/min and 1 x 5L/min flow regulators. Bristan Rio Shower Benefits Easy installation with adjustable elbow inlets which enable you to use on existing pipework centres between 110mm and 155mm so there's.