Victaulic Globe Back to Back and Low Flow attic protection schemes provide designers with all of the tools needed for their toolbox, the company says. When water supplies are better than moderate, a Back to Back scheme utilizing Globe V8122, V8123, V8124, and V5623 sprinklers is now available. The Low Flow scheme, utilizing Globe V5620 and V5621 sprinklers, provides tested and effective protection of the attic when water supplies are moderate to less than moderate, it adds. Both attic protection schemes are designed to optimize water delivery and reduce total installed project cost. Victaulic.