Dip Tube type surge vessels provide functionality similar to one equipped with an air compressor but without the need for a compressor. The dip tube controls the closure of the air vent when the tank is filling, and the length of the dipping tube is varied to maintain the required initial air volume under normal operating conditions. Such vessels are usually preferred for flatter pipe profiles.
The dip tube is in SS 316L and the air valves can be provided for sewerage or clean water applications.