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The valves are designed for use only in an indirect open vented or sealed water filled central heating and/or indirect hot water system and for no other purpose. They must be used within the pressure and temp limits, system water temp at 5 bar 120c and operating temp at 65c is 10 bar.. Pegler Yorkshire Terrier Wheelhead Radiator Valve Angled Pattern & Push Fit Straight Connector - 10mm White 661003