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I can say it has worked perfectly these last three Winters. To Winterize; I first turn the underground shutoff valve to Off, then drain the backflow (bonnet/poppet) by opening the screw valves, then I unscrew the two caps on the tees to fully drain. Really don’t need to cover it now but I still do…habit…
Tip: I leave a little dirt on top of the underground shutoff valve, have read some will fill the underground valve enclosure with insulation which my thought is it getting and remaining wet may defeat its purpose…fyi, the valve enclosure drains good and never holds water, just make sure no clay dirt is used…
Attached a better picture of the Backflow-Union Assembly…