This Bristan Sirrus Gummers Shower Valve Adjustable Pipe Centres - Adjustable Elbows Meaning this shower will replace Showers with 110mm centres, 130mm centres, 138mm centres as well as the industry standard 150mm, and anything inbetween. See below for further details on this Bristan Mini mixer. Bristan Gummers Mini Opac Shower Features Automatic thermostatic shut-off in the event of hot or cold water failure. Check valves and serviceable filters as standard Chrome plated to BS EN 248. Guarantee: 1 year covering manufacturing faults. Valve Only - No Riser Kit Included Elbows can be adjusted for exposed pipework running up and down the wall at the wide range of centres mentioned above. Each Bristan Mini Valve comes with 2 sets of elbows allowing you to replace almost any shower mixer valve which has centres or 110mm or 155mm or anything inbetween. Choose the correct elbow configuration to suit your Inlet centres: 2 x small elbows 110-130 centres 2 x large elbows 136-155 1 small elbow / 1 large elbow 125-145