Do all flush valves fit all toilets?

No, not all toilet fill valves fit all toilets. Toilet fill valves come in different sizes and designs, so it's important to match the right valve to your specific toilet model. There are a few key factors to consider:

1. Toilet Tank Size and Shape

   Some toilets have larger or smaller tanks, or different shapes, which might require specific fill valve sizes or types.

2. Connection Type

   Fill valves may have different types of connections, like a threaded connection or a slip-on style. You’ll need to ensure the valve you choose is compatible with the type of connection your toilet uses.

3. Height Adjustment

   Some fill valves are adjustable in height, which is useful for toilets with varying tank heights. If the fill valve isn't adjustable, it may not be the right fit.

4. Water Supply Size

   Make sure the valve fits the size of your water supply line. Most toilets use a 7/8" connection, but it's good to double-check.

5. Flush Valve Design

   Certain toilets (like older models or specific brands) may require a particular type of fill valve that works with their unique flush mechanism.

If you’re replacing a fill valve, it’s best to bring the old valve to a hardware store or consult your toilet’s manufacturer for the correct replacement model.