Monroe 901813 Max-Lift Gas Charged Lift Support Lift Support functions to hold hoods, trunks, windows and doors. Nitro-Carburized Rod: For exceptional corrosion resistance and durability. Durable Plastic Rod Guide reduces potential rod abrasion. Main seal provides positive closure for high-pressure gas. Stop Collar and Limiting Groove assure precise extended length. High-Strength Piston Assembly with leak-resistant seal helps prevent fluid leakage around the piston, allowing the fluid to pass efficiently through the piston valving components, providing controlled lift and consistent performance.