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The standard unit is rated at 175PSI with a 300PSI unit available for high pressure applications. Standard Profile Sprinkler FlexHead 56 Lowland Street, Holliston, MA 01746 Tel: 800-829-6975 / (508) 893-9596 Fax: (508) 893-6020 mstrong Seismically qualified FlexHead flexible sprinkler connections allow for independent movement between sub-mains and ceilings. Armstrong and FlexHead have tested this system at the State University of New York at Buffalo (SUNY). They're qualified for use in Se