Pulsatron Pulsafeeder Bleed Valve Assemblies Efficient Air Expulsion for Accurate Pump Priming, PVC Kynar, 3 8" & 1 2" Sizes Available Marking and Warning Variety of Size Combinations: Available Type AA Double Male Variety of Size Combinations: Available in combinations from 1 1 2" to 6" this float switch offers a simple yet effective way to control pumps or alarms based on fluid levels Effective Priming: Expels air from the pump head and suction line to facilitate efficient pump priming Pulsatron Pulsafeeder Bleed Valve Assemblies are essential for maintaining the efficiency and accuracy of your chemical metering pumps