VFA-21-BV is a series VF Visi-Float® acrylic flowmeter, a line of direct reading, precision machined, clear acrylic body flowmeter suitable for both gas and liquid applications. The fabrication of the Visi-Float® flowmeters is backed by over 60 years of experience in acrylic instrument machining. Low installation costs with back or end connection options with metal mounting inserts that can be supported directly by system piping. Typical applications include medical equipment, laboratory equipment, air samplers, gas analyzers, pollution monitors, chemical injectors, cabinet purging.