Features:

Manual opener (on all models, except straight-through, normally open valves) for valve operation on power failure
valve returns to automatic position when power is restored.
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.

Specifications:

Manufacturer: Honeywell
Manufacturer Part Number: V8043A1313
Product Type: Zone Valve
Nominal Size: 1"
Dimensions: 7.95" x 4.85" x 3.45"
Weight: 2.72 lb.