Sounds like you found the gray tank valve for the galley located street side near axles, There should be another gray tank for the bathroom shower and sink that gray tank valve is located street side up front mine is near the hot water tank. Next to that gray valve you should find the black tank valve
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2013 RAPTOR 300MP w/Rear Patio Deck NO Folding Side Ladder
2013 Silverado 3500HD LTZ CC LB 4X4 DRW
Duramax 6.6L Turbo Diesel; Allison Trans
Reese 20K; Carlisle Radial Trail RH/HD; TPMS (12 Tires)
Veteran
PSU (GO LIONS)
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