What supplies water to the RV sink?

The water supply system of the RV sink is usually achieved through a built-in water pump. This water pump system is designed to draw water from the RV's water tank and then deliver it to the kitchen sink or bathroom faucet. The water tank is usually located at the bottom of the RV or in a specifically designed location. Its capacity can vary depending on the size and design of the RV, but it is usually enough to support daily use for a period of time.
The water pump is usually electric and can be started and stopped by a switch or control panel inside the RV. Some simpler systems may use a manual pump that requires manual operation to pump water. The water pump is connected to the sink through a pipe system, allowing water to flow from the water tank to the sink.
For situations where there is no external water source, the water pump system is crucial because it ensures an independent supply of water inside the RV. Some advanced RVs may also be equipped with additional filter systems to purify the water quality to ensure a cleaner and safer water supply. In some cases, the RV can also choose to connect to an external water source, such as a faucet at a campsite, in which case the water pump system can selectively direct water from the external water source into the RV's water supply system.
In summary, the RV sump water supply system draws water from the water tank through a built-in water pump to ensure that the RV can get a stable water supply when moving or staying.