"I have some plumbing experience from my previous position; however, it is basic plumbing such as clogged drains and leaking toilets. For severe plumbing issues, I do call a professional and accredited plumber."
"I wouldn't say that I have plumbing experience; however, I do have plumbing knowledge. Which types of plumbing tasks do you expect I will encounter in this role?"
"I have performed a great deal of residential and commercial plumbing ranging from appliance repair to installing and repairing water supply lines. Could you share with me the types of plumbing work that would come up in this role?"