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			50psi on the tank when empty w 50 psi on the water hose.  you fill it at the house until it goes static.  the t handle is a threaded plug where i add squirt of soap.  also, when i get home and back it in the shed, i just hook up a hose and let it spray for about 10 minutes, then close both valves and it is loaded for the next trip.i don't have brakes, but for you guys that do, you could plumb this into flush ports.
 
 the beauty of this is you get a pressurized water source to wash off your trailer with no pumps , wires, batteries, etc. and there is not  anything to steal  at the ramp.
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