The plumber logo can incorporate elements related to plumbing to visually represent the profession. One idea is to create a logo that features a wrench or pipe wrench, which are commonly associated with plumbing. The wrench can be stylized or incorporated into the overall design. You can also include a water droplet or water wave to emphasize the plumbing aspect. Consider using blue tones to symbolize water and trust. The typography should be clear, legible, and professional, with the name of the plumbing business displayed prominently.