German Renner RAT Series cold-regenerating adsorption dryers are a complete air-treatment system with integrated pre- and after-filter and an automatic condensate drain. In the RAT-S, all mechanical and electronic components are combined in a compact multifunction block, and desiccant is supplied in convenient cartridges for easy storage, transport, and replacement. The RAT-40 uses two drying vessels — one dries the incoming air while the other regenerates. The Superplus version provides dew-point-dependent capacity control with continuous outlet measurement. Pressure dew point down to -40 °C (-70 °C on request).