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I read a reference to the requirement that the pre-action valves had to be opened and inspected annually 13.4.3.3  is this true as I was also given other information.?

Question asked by wmgonzalez58 on Mar 22, 2018
Latest reply on Jul 25, 2018 by wmgonzalez58

Pre action sprikler system inspection are they done annually?

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