As a general maintenance professional it is very helpful to have a long list of skills. Talk to the interviewer about the variety of skills that you possess.
"I would consider myself a very well rounded maintenance professional because my background is so diverse. I began my career as an electrician and have trained professionally as a plumber and also bring experience in HVAC. If I don't have direct experience, I will conduct some research on the topic and can generally pick it up very quickly."
"At this time, the bulk of my educational focus has been on plumbing, with a small amount of knowledge in electrical. I do hope to consider myself to be a jack of all trades. However, I am not quite there yet."
"I have been a maintenance professional for over twelve years and can say, with certainty, that I am a jack of all trades. I can do it all! Are there specific skills that you would like me to highlight for you?"