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A standard toilet flange should fit snugly into the outflow pipe and sit level with the subfloor. Installing a new one without first removing the old one will make it impossible to form a seal and keep the toilet bowl bolted securely in place. 

However, if you’re dealing with leakage or wobbling because you’ve installed a new type of bathroom tile (making the floor taller), you may be able to avoid fully replacing the flange by opting for a toilet flange extender. Extenders typically come in kits for easy DIY installation, fit over the existing flange, and bring the drain connection higher.

You can tell if your toilet fill valve is full by removing the lid and taking a look. When you flush the toilet, the float is at the bottom of the tank, the water empties, and the fill valve opens. The float rises to the top as the tank fills again with water. When the float rises to the right level, the fill valve closes; if the valve is too high, your toilet may only partially flush, requiring you to adjust the float. 

You generally cannot replace a 10-inch rough-in toilet with a 12-inch model without making significant plumbing updates. A 12-inch rough-in toilet will not fit a 10-inch rough-in space because the floor drain is in the wrong position. To accommodate the larger toilet, you would need to move the drainpipe, which could cost between $0.75 and $30 per linear foot, plus labor. In most cases, it is more cost-effective and simpler to purchase a new 10-inch rough-in toilet. However, it is possible to install a 10-inch rough-in toilet in a 12-inch space by using a longer connector.

The average cost to hire a plumber is typically between $45 and $200 per hour, with a common average rate around $125 per hour. This cost can vary based on your location, the plumber's experience, and the complexity of the job. Rates are often broken down by experience level: an apprentice may charge $45 to $90 an hour, a journeyman $60 to $110 an hour, and a master plumber $80 to $200 an hour. While hourly rates are standard, some plumbers may charge a flat fee for routine projects or offer project-based pricing. It's also common for plumbers to charge a minimum service or trip fee. For reference, some typical flat-rate costs for common jobs include: drain unclogging ($220), leaky faucet repair ($270), burst pipe repair ($400), toilet repair ($300), and water heater repair ($600). Note that these rates are for standard service hours; emergency, holiday, and after-hours calls will cost significantly more.