why does the shower become hot when you flush the toilet
Why Does Shower Pressure Change When a Toilet Flushes? A pressure-balancing valve keeps your shower comfortable. If you live in an older house, and you have to ask people not to flush the toilet when you're in the shower, you need to install a pressure-balancing shower valve. Because some 200,000 Americans are scalded every year, many states have started requiring these valves in all residential showers.