I have been using one of these for several years. Open the grey tank valve a little to check for leaks, if none open completely then slowly open the black valve. You will see the water movement in the clear plastic cover. In places where you can dump grey water, without FHU, just attach a garden hose.
Waste Valve Clear Cap, 3" - T1020-1CLR - 89-8373
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Howard & Elaine
2001 Newmar Dutch Star 4095, CAT 330
2014 SRX toad, M&G breaking, Blue OX Avail
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