Large Pipe can be used to transmit water from the Water Pump Station. Large Pipes can transmit water up to 764 tiles from a Water Pump Station. Large Pipes offer a large boost in tunnel digging speed. Prisoners always start their tunnels under the toilet in their cell. For this reason it is important to use small pipes to connect to toilets.
As of Alpha 36, sometimes large pipes burst (Random Event) and spill water everywhere. it is advised to quickly rebuild, block or turn off the water supply because it will continue to spread.