The Schwingmetall L-series hydromount from ContiTech is derived from a hydraulic engine mount with two working chambers. A pneumatic spring replaces the standard elastomer spring, while inside the mount, a membrane separates the hydraulic unit from the air chamber. The 23.6-in (600-mm) mount is fitted with a controllable spring travel. A compressed air cushion determines the spring rate and height of the mount, making it height-adjustable. A natural frequency of 2 Hz improves cab comfort, and the air suspension permits a bearing load from 70 to 300 kg (154 to 661 lb) that is capable of suspending various cabs on off-highway and agricultural vehicles. The L-series can be operated in vehicles with an 8-bar (116-psi) onboard pressurized air compressor. The hydromount features a solid four-hole flange and an air supply on the bottom; damping behavior can be customized along certain parameters.