Taco zone valve power head replacement

Taco zone valve power head replacement. Repair Taco 570 series 571-2, 571-3 etc. by replace power head.

Note: as people have commented, at about 6:40 into the video, the lever on the power head should be in the "auto" position (*not* in the manual position) when removing the head from the valve (and of course no power should be applied to the head).