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• D171 Ball Valves are light, compact units which are easy to install and operate, yet their robust construction ensures long, trouble free service life. • D171 and D171EXS are WRAS approved for use on hot and cold water systems up to 85°C. • Extension stem (EXS) to enable valve operation whilst the valve and associated pipework is surrounded with insulation or if the valve is in a hard to access area. • Conforms to BS EN 13547
