Welcome to Top One Plumbing, your go-to source for all things related to main line replacement and upgrading in Toronto. We understand that dealing with low water pressure and the threat of backflow can be a major concern, which is why our team of certified plumbers is here to help. Our plumbers have years of experience working with main lines, ensuring that your water pressure is at optimal level and your home is protected from backflow. We specialize in upgrading from 1/2″ to 1″ main lines, which can significantly increase water pressure in your home. We offer a full range of services to address main line issues, including: Inspection and diagnosis of the problemUpgrading of main lines from 1/2″ to 1″ Installation of backwater valves to prevent backflow We use the latest technology and techniques to ensure that your main line upgrade is done quickly, efficiently and effectively. Our plumbers are fully licensed and insured, and we stand behind our work with a 100% satisfaction guarantee. Don’t let low water pressure and the threat of backflow disrupt your daily life. Contact Top One Plumbing today and let us handle all your main line upgrading needs. With our expertise, proper design and rebate options, you can trust that your water pressure will be high and your home will be protected.