I have spoken about this before but I thought of making a thread for this. Home - Automatic Water Drainage
It costs very little and you also have the possibility to add a receptacle to discretely collect the condensation without necessarily see it dripping from your horn
Few years ago I saw this new automatic valve in Frankfurt , originally thought to equip brass instruments can be used to fit a baritone sax. The valve doesn't require being opened and close to drain condensation.
The second video shows installing on a Baritone saxophone