DTW is a self-acting, adjustable, non-electric thermostatic operator. It has adjustable max./min. temperature, selected temperature locking feature and can be shutoff completely if required. The symbol * protects against frost damage. Each DTW thermostatic operator is individually calibrated and conforms to ASHRAE standardization rules for temperature regulation. The DTW’s smooth shape and narrow air gaps gives a nice operation and makes it easy to keep clean. DTW has a connection that is M30x1.5 and will be delivered with an adapter so they can be mounted on all Macon NT series valves.