I like the fact that the screw in brass fitting was narrow enough to get into the compartment where the male threads for connection are. Also, it came with a rubber washer. It was a perfect fit. (Note: my humidifier had access to the fitting from inside as well (after removing removable tank). That made screwing the fitting in easy. Of someone does not have access from inside the humidifier, wrap painter's tape between the brass fitting and hose and grip the hose to screw it inensuring that you don't overtighten.