Many owners have written that they "found the three black handles, but turning did nothing", because you have to PULL THEM UP, like the waste valves. Do you have black or white handled valves? or No valves? Some, you have to crawl under and remove threaded pipe caps, but suspect GS didn't do that? Those black handles also have a SS clip, can remove and clean, lube or repair valves with new O-rings. Good Luck.
CAUTION: ALSO, Beware pressurizing FW TANK, many will split wide open if pressurized, whether air or water pressure.
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THenne1713
2000 Conquest LE 6266, Class-C on 99-E450SD, 6.8, 2v, V-10
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