The Two-wire Thermal Actuator for TruFLOW™ Classic and Jr. Valved Manifolds is a slow-opening thermal actuator that mounts directly onto TruFLOW™ Classic and TruFLOW™ Jr. Valved Manifolds and connects to the Uponor Climate Control™ Zoning System C-55 Base Unit (A3601012). It provides individual loop flow control on a multi-zoned manifold.