Cen-Tec Systems 93741 Central Vacuum Garage Attachment Kit with 50 ft. Hose, Black

My hole house vac has an 1 1/2” opening will this fit tight?

Phoenix brand compatible?

Does the accessory kit come separately? All that came in the box was the orange hose.

Is there a power switch on the handle? I would be plugging this into the vacuum outlet, my unit is in the basement