This 2-post lift has the chain-over-roller cylinder configuration. There are two popular hydraulic cylinder configurations used in two post electric/hydraulic above ground lifts: Greg Smith Equipment sells above ground lifts that incorporate both the direct drive cylinder configuration and the chain-over-roller cylinder configuration. The base plate two post above ground lift implements the chain-over-roller configuration. This is the only hydraulic cylinder system that is possible in the base plate lift. The base plate two post above ground is designed for "low ceilings". The direct drive hydraulic cylinder configuration cannot be used in the base plate lift because the hydraulic cylinder would extend above the 9' column when the lift arms were raised to the maximum height. The "overhead" two post above ground lift may incorporate either the direct drive hydraulic cylinder or the chain-over-roller hydraulic cylinder.