Easiest and safest is hook up water supply to water inlet to trailer. Turn the water on and go to t the bathroom and hold the foot paddle down until you see water in toilet riser. Now simply release paddle water flow stops and go outside to pull discharge lever.
Repeat as neccessary.
Leaving the lever closed, you take a risk of someone coming up to you and get involved with conversation, all of a sudden you hear a pop and its to late, trust me. Never again.
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