Welcome to the forum.
Hopefully someone with a similar trailer will be along to help, but until that happens...
Like yours, we have stickers on the outside of our trailer. But, our low point drains are on the inside, underneath our bathroom vanity, on the floor. They are a PIA to get to. I need to lie down on the bathroom floor to get hand on them to actuate them. They are small 'lift up'/'push down' valves (ie they don't rotate).
Hope that helps a bit. Good luck.
Sherm & Terry w/rescues Steve (std Poodle) & Eydie (min Schnauzer)
2015 Jay Flight 27RLS (Camped: 102 nights 2015, 90 nights 2016)
2006 Ford F350 6.0 PSD, Lariat, 4WD, CC, LB, SRW, auto., Camper pkg.