Check the listing for details. Netafim 2" Pro Air Vent. Condition: New. Listed at 161.25 USD. Netafim 2" FPT Pro Air Vent is a high capacity combination air/vacuum and continuous acting air vent that seals at very low pressure, 1 PSI. The Pro Air Vent combines the features of both an air release and an air and vacuum vent. The sealing assembly has a unique patented rolling seal which allows gradual opening and closing. The float and seal are contained in a one-piece unit that is easy to remove and replace as needed. This durable light-weight vent is ideal for plastic pipe systems in a variety of applications.Pump stations - after the pump and after the check valveDownstream (after) and upstream (before) shut-off valvesAfter deep well pumpsOn long, constant sloped pipeline segmentsAt peaks along the pipeline and at peaks relative to hydraulic gradientAt end linesBefore water metersOn strainers and filtersHow It WorksThe air release component is designed to automatically release small pockets of air to the atmosphere as they accumulate along a pipeline or piping system when it is full and operating under pressureThe air and vacuum component is designed to automatically discharge or admit large volumes of air during the filling or draining of a piping systemThis air vent will open to relieve negative pressures whenever water column separation occurs