Wine/Beer Thief, 19 Long

How long is it? I assume it has to reach the bottom of the 5 gallon carboy to activate the valve?

Will this work for 1 gallon jugs, with 1 3/8 inch mouth openings????

I need help working this. The valve tip does not open when you insert into the liquid, Therefore the wine is draining out the bottom/tip. User error?

Does it require a separate Fermtech siphon piece to operate or has all you need?