Is this trailer new to you or have you had it a long time? I'm assuming new to you if the 2nd grey tank is full and you don't know where the drain valve is. What model is it? 5th wheel or bumper pull?
I had a 14 Cougar High Country 319rls. My 2 main pulls were labeled and beside each other by the main dump valve. The other was up under the side, through the frame in front of the tires - silver handle. You had to get under to see it if you didn't know where it was.
Aside from that, if you are leaving your grey tanks open how are you cleaning that sewer line/connections after you dump the black tank? There are different groups of thought on it but I do not and would not leave my grey tank valves open. I did it for one 3 month trip. Went to pick up the hose and it weighed 20 lbs. because it was full of sludge, goo etc. that accumulated over that time because there was never enough flow to just push it on out. Threw it away and dump grey when I dump black (I hope you are leaving it closed?).
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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