I don't have enough salary data specifically for part-time plumbers to give you a reliable comparison. However, industry standards suggest that full-time plumbers typically earn between $40K-$70K annually, depending on experience, location, and the complexity of the work.
For part-time positions, you could estimate earnings based on hourly rates, which usually range from $20 to $40 per hour for plumbers. Keep in mind that these figures can vary widely based on geographic location and demand for plumbing services.
If you have a specific location in mind, I can look for more tailored data.