The cascade systems can be mounted vertically or horizontally and can be used in a stationary or mobile application. The cylinders weigh 155 lbs empty. They measure 9 5/16” diameter by 51” overall height. The cylinders must be hydrotested every 10 years. Each complete system includes: New DOT 4500 psi cylinders, 444 CF, Tees, Pigtails, Nut & Nipples, Adapters and Fill Assembly. High pressure safety regulator is recommended and sold separately.