What size toilet siphon do you need?

The size of a toilet siphon typically refers to the diameter of the siphon or flush valve, which is commonly 2 inches for standard toilets. However, some high-efficiency models may have larger siphons to enhance flushing performance. It's important to check the manufacturer's specifications for your specific toilet model to ensure compatibility. If you're replacing a siphon, measuring the existing one can also help determine the correct size.