Designed with a 1/2 inch bore and a precision-cut 1/8" x 1/16" keyseat

This part is essential for ensuring your hydronic heating equipment meets stringent safety and performance standards

The GRD10A-601 is engineered for a precise fit with Johnson Controls T22

Engineered for normally open operation

Constructed from high-grade brass and copper to resist corrosion in high-humidity environments

Siemens Building Technology 331-2961 Actuator 321042-401 Designed with a 1/2 inchThe Siemens 331 2961 is a high performance No. 4 pneumatic damper actuator engineered for precise control in commercial HVAC systems. This rugged, metal fabricated pneumatic piston actuator features a 4 inch stroke and is designed for the gradual or positive actuation of dampers in ventilating systems, mixing boxes, and air handling units. With a 8 13 psi spring range, it provides the necessary force for reliable operation in high demand environments.