You might try a garden hose. If you cannot get pressure they have a device at HomeDepot or Lowes that goes on the end of the garden hose and looks like a 6" section of fat rubber. You insert it into the pipe and turn the water on, it inflates to seal the pipe and then water flows through the pipe. It is used for pressurizing pipes to blast clogs out. I just used one today on a drain pipe.
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