The hydraulic vangs enable the mainsail leech tension to be trimmed to an extremely fine degree from the cockpit; they also provide boom lift in light air conditions, when furling, reefing or flacking. Hi-tech materials and advanced design for top performance, reliability and lightweight. Black hard coated aluminium for cylinder tube and terminals, Nitronic 50 stainless steel for piston rod and 17-4-PH stainless steel for pins. For the safety of the yacht, the vang can be instantaneously dumped using the CARITEC quick release valve.