Drum Gauges are the simplest and most effective way to meter chemicals. The Plainsman Drum Gauges come calibrated for rate and volume on 55 gallon drums. Choose from a plain P596 gauge or a P779 with a built-in rate testing valve. P596 & P779 Drum Gauge Standard Features drum guage Designed for Horizontal 55 Gallon Drum 3/4″ NPT inlet, 1/4″ NPT outlet retaining pin hole not drilled through the front o casting to protect operator from overflow spill or spray. Special seal used in critical seal area instead of o-ring for better seal and longer glass life. Cast aluminum frame is dual calibrated and serves as a volume and rate gauge Optional vent connection Floating Sight ball for easy fluid level indication P596 Drum Gauge Only Optional stainless steel nipple P779 Drum Gauge Only Complete with spring loaded test valve for rate tests Optional stainless steel valve Optional extra long valve Teflon seals in valve