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PRO-BALANCE flow gauge kits can be used to replace flow gauges on the supply side of the PRO-BALANCE manifolds and connect directly with a 3/8 in threaded connection. The replacement flow gauges have an integrated shut-off valve that is manually activated with a common vent key. Liquid thread sealant should be used when reinstalling flow gauges. Thread sealant should be liquid, medium strength sealant.