RPG's 20-Ton Shorty Air Bottle Jack offers a powerful, high speed motor and a self-returning spring for efficient, effortless operation. For added strength and durability, the air bottle jack has a welded cylinder and reservoir, as well as chrome-plated rams for resisting rust and wear. The axle jack features a built-in bypass device to protect the hydraulic system from over pumping damage, a built-in muffler to promote quiet operation and a built-in in-line air filter for extended motor life. For ease of mobility and remote operation, a 1/4" quick connect feature is also included.