Glass drink dispenser for vinegar long term storage?
Don't use brass– I believe the vinegar cleans it by dissolving a thin layer from the outside. It looks like the 304 stainless steel tap should work fine.

If the rubber seal is the same material that canning (e.g. Weck) jars use, it'll probably be fine. Weck only warns against overheating vinegar solutions, which can cause the seals to become distorted— they don't recommend against using vinegar altogether. If you can find out what rubber, specifically is being used in the seal, you can check it out on this chart

I really don't think you'll have to worry about the glass wearing down. Really.

Your other option is to keep it in the plastic container and use a 5 litre bottle pump dispenser, which works with everything from cooking oil to mayonnaise to corrosive cleaning chemicals.