The YAK 92000 22 Ton Portable Air Hydraulic Jack is a professional grade jack manufactured in Italy with the highest quality components available. This high quality jack is built with a special “venturi valve” that sucks the fluid back out of the cylinder head to lower the jack. This valve never allows compressed air into the cylinder, thus extending the life of the jack by many years. All units have brass air motors which last much longer than traditional aluminum or steel air motors you find in most jacks. Additionally, brass air motors will run better the more you use the jack because the brass gets smoother with age. Brass components do not build up grey matter like aluminum motors or rust like traditional steel air motors. Additional features include an enhanced exhaust design that allows potential dirt and debris from your air source to be easily pushed out. The design also allows for easy replacement or cleaning of the exhaust filter. All units have lead free paint as well as high-grade graphite seals and O-rings. All YAK jacks come with a 3 year . This jack also comes with 3 stackable extensions; 0. 5 in. , 2. 75 in. and 4. 75 in. extensions. Minimum height is 5. 51 in. and maximum height is 12. 05 in. without extensions. Unit weight is 38. 5 lbs.