I use:
A piece of 1 3/8 O.D. vinyl , reinforced tubing from Home Depot,( about 2 inches long, to slip into carboy neck), a PVC elbow that will slip over the O.D. of said tubing, and then a longer piece of the same tubing into a small container of sanitizer.
The elbow allows you to route the tubing downward to your container, as it's not real cooperative on the flexible action.
Be advised: once the "stub" piece in the carboy gets all "krausened up", I have to grab it with some pliers and kind of roll it on itself to un-stick it.
Lube the stub piece with sanitizer to fit into the carboy neck, it be a snug fit!