To effectively dive sidemount you will need some specialized equipment. Depending on the environment you are diving in or your overall size and height, there are numerous variations and preferences for sidemount configuration. Sidemount diving typically uses two single cylinders that are attached along each side of the diver as opposed to on their back. Some of the most common cylinder sizes used today are the Aluminum 80's or the Steel 85's. They both offer a diameter of less than 8 inches which helps to minimize drag on the diver when swimming. Traditionally one sidemount cylinder will use a regulator system with a longer LP hose of either {60 in | 1.5 m} or {84 in | 2.1 m} while the other cylinder will have a regulator with a shorter length LP hose of { 22 in | 56 cm }. This shorter length second stage will be stored on a “necklace” worn around the divers’ neck that allows this second stage to hang just under the divers chin, conveniently located and always available. The longer hose is usually stored under a hose retainer around the cylinder that is part of the mounting system i.e stage straps. Stage straps are used to allow the cylinder to be attached to the 'butt plate' of the diver harness using bolt snaps. Two compact SPG's on a { 6 in | 15 cm } HP hose are used as each cylinder requires an accurate gauge for proper gas management. A few additional snaps are used for streamlining along with angled adapters at the second stages that allow for reduced jaw fatigue and proper alignment of the hoses.