A tippet connectors is one of those things that you might not actually need but will certainly appreciate. It makes tying the very light line used to snell the tanago hooks to your main line a snap.
Tie your main line to the eye of the tippet connector. Pull the snell line into the tight hook part of the tippet connector. Then wrap it around the connector once and pull it into the hook again. If you use the lightest of the Japanese micro fishing lines, you will have to wrap it around the connector twice to hold it securely.
The line won't slip and you don't have to tie a knot it the very fine line.