Quite a number of posts have highlighted the problem of not receiving a diet drink when you ask for one. Recently a barman showed me the connectors were different on these multi-dispensers. His view was that anyone who gave you a standard coke when you asked for one was either careless, not paying attention or being downright malicious. He also said that the landlord had told them that anybody making that mistake would be disciplined (landlord?s wife is Type II)!