The Uponor Two-wire Thermal Actuator for Stainless-steel Manifolds is a slow-opening thermal actuator that mounts directly onto Uponor Stainless-steel 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. Uponor Thermal Actuator, 0.167 A, 24 V AC, 3 to 5 min Time to Open/Close, 2.51 in H x 1.58 in W x 1.58 in D, Import