Product review (5 stars): perfect fit. I did not know this was needed.
My solenoid valve went  bad several years ago so i removed the core and used the needle valve to control flow. Had no idea what I was doing but it worked with frequent checks. This year I replaced solenoid and needle valve. Thought I was through but humidstat did not send voltage to solenoid valve. By reading all the comments for solenoid valve and humidstat, I was able to fix the humidifier with a new humidstat and of course the yellow orifice which was missing. Got quite an education in the process. Thanks everyone for taking the time to share your experiences.