ECCPP Rear Liftgate Hatch Lift Supports Gas Springs Struts Shocks for 2004-2010 Toyota Sienna Compatible with 4590 Strut Set of 2 FITMENT - Lift supports struts rods shocks for 2004 2005 2006 2007 2008 2009 2010 Toyota Sienna Compatible with SG229013 4590 lift support strut gas spring QUALITY - Rust-resistant Nitride corrosion resistant piston rod extends product life, Multi-Lobe Seal make gas springs more tolerant to vibration and extreme temperature, 100% brand new and tested to meet or exceed OEM specifications FUNCTION - Use compressed gas, contained in a cylinder and compressed by a piston, to exert a force to support the weight of front hood or rear liftgate tailgate trunk hatchback doors while they are open, no need to hold the door up with your head EASY INSTALLATION - Easy to install with simple hand tools in just minutes - no special tools required for installation NOTICE - Please check the description and compatibility chart before your purchasing. We provide ONE YEAR WARRANTY for all our lift supports. Please contact us if you have any question Your lift support is beginning to wear-out when the gate or hood is difficult to lift, begins to sag when it&#039;s in an open position, or can&#039;t be held into position without some other propping device. That can turn into a physical catastrophe if the lift fails to open or slams closed when in the open position.This is very dangerous! All lift supports eventually have to be replaced because they have a small gas-charge which naturally escapes over time through the lift support seal. Lift supports generally wear-out in 3-5 years. Extremes in weather (extreme hot or cold) or abnormally excessive opening or closing will shorten the life of your lift support.