TACO Zone Valve Power Head (Series 570)

I woke this morning to no heat in the north section on our home. I check the thermostat and it was showing the demand at 72 degrees and temperature at 64 degrees. I felt both zone valve and both were warm. I didn't see the manual override lever. I Goggle the "Zone Valve Power Head (Series 570)" and came up with a Manuel override. Piece of cake from there; "Turn the thermostat off, twist clock to remove" Once off I saw the Manuel level. Replace the unit close the level and we have heat. I found a unit online for 64 dollars plus shipping. I call local and for a plumber supply that has one for 63 dollars plus tax. Almost the same cost but no waiting for a few days as I played thematic control.