Two-way, straight-through | all models may be installed without disassembling the valve | compact construction for easy installation | complete Powerhead may be removed or replaced without breaking plumbing line connections or draining the system | actuator motor may be replaced without removing the valve body or draining the system | valve designed for cycling (not constantly powered on) applications | on-off and two-way lowage valves consist of an actuator and valve assembly for controlling the flow of hot water and some models for steam. - manufacturer: Honeywell