Honeywell Pneumatic actuator, MP953
High Temperature Applications, the following bonnet extentions must be used with MP953 actuators when the flowing medium temperature is 150 to 220 degrees C, to give extra air circulation and less conduction of heat from the valve body to the actuator.

Used with V5049A up to 65mm, V5050A up to 80mm, V5328A 40mm to 80mm, V5329A 40mm to 80mm