LK 422 Manifold Shunt TmaxLK 422 Manifold Shunt Tmax LK Manifold Shunt Tmax is used in systems with the main pump. The shunt unit can be mounted directly to LK Manifold RF from the left or right. The shunt unit is fitted as standard with a constant thermostat controlled feed temperature as well as an automatic speed controlled pump for reduced energy consumption and quieter operation. The guideline capacity of this shunt unit is a maximum of 130 m floor heating surface. The