Fitment: For Ford F250 Super Duty 2017-2019 For Ford F350 Super Duty 2017-2019 For Ford F450 Super Duty 2017 Does not fit cab chassis models Fit Single/Dual Rear Wheel (SRW,DRW) models Can work with most side-mount fifth-wheel hitches. Require drilling for installation Package Includes: 2x Air springs (w/ Internal Jounce Bumper) Air lines Schrader valve Mounting Bracket HardwareJust as picture showed Capacity: up to 5,000 lbs Placement: Rear Feature: Keep proper ride height Replace your factory jounce bumper Can safely run with zero air pressure Reduce bouncing at the rear of vehicle when towing Air pressure in the springs can be adjusted5 - 100 psi manually Stop vehicle’s main springs from sagging (due to constant load compression) When towing / hauling heavy loads,air springs raise safety /comfort working with your suspension Two adjustable secondary air helper springs can add up to 5,000 pounds of leveling capacity per axle for vehicles with leaf springs Can be used on heavier duty applications like 1-ton pickup trucks,commercial fleet vehicles,mobile homes1.Notice：California Prop 65 Warning 2.Code: MXR02FXSY 3.Authority ID：MXR02FXSY