Constructed of a special polymer resin with marine grade brass housing to reduce weight Precision engineered Neutrally buoyant Pre-dive / dive toggle switch prevents freeflow at the surface Includes 36” (90cm) high flow hose specially designed for this regulator The IST O20 Premium Scuba Diving Backup Regulator, Octopus offers superb precision engineering. Designed for reliable functionality, effortless breathing, easy maintenance and safety. Lightweight, neutrally buoyant second stage is constructed of a special polymer resin with marine grade brass housing. The reduction in weight reduces jaw fatigue and helps make your dive more comfortable. Pre-dive / dive switch on top of housing toggles on and off to prevent the valve from freeflowing at the surface. Includes 36” (90cm) high flow 2nd stage hose specially designed for this regulator.