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Fluid Metering Inc.’s miniature “H” Series Pump Heads are available with an isolation gland to provide a fluid barrier between the pumped process fluid and the atmosphere. Isolation gland pumps have extra ports which are connected to a fluid source. The fluid flowing through the gland ports provides a barrier which isolates the pumped process fluid from the seal area and atmosphere. These pumps are useful for the maintenance-free dispensing of wash fluids.