Bristan Gummers Opac Thermostatic Exposed Shower Valve with Isolation Elbows. This unit can be used to replace the MINI TS1203 EL C H Opac which has 175mm centres. Single sequential control for both temperature flow. Isolation elbows included as standard Automatic thermostatic shut-off in the event of hot or cold water failure. Check valves and serviceable filters as standard Supplied as valve only Chrome plated to BS EN 248.