Mares Rover 2S RegulatorRover 2S Regulator 2S First Stage The 2S is a lightweight, robust and compact piston first stage. Equipped with a dedicated seat for RFID chips. The DIN300 first stage weighs 432g. The INT version weighs 608g. The sandblasted finish increases scratch resistance. Rover Second Stage The Rover second stage guarantees high performance, even after intensive use. The new large purge button features a 'dynamic hinge' design, which makes it easy to activate,