The Airflo Superflo Anchor Tip does just that and anchors the tip at depth even in windy/rough conditions. Often the key to success when nymphing or buzzer fishing is a static presentation, and in a squally wind or rough conditions, floating lines just wash around in the wave chop. The anchor tip has a 3' mini tip (1.5ips) with an additional 6" of Di 7 at the tip (7ips).
This line is your friend for early-season chironomid sessions. Looped tip and butt.