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My Lance trailer has 2 grey tanks.
Should have 1 tank that drains with black tank.
Drain black tank, close valve & drain grey tank, this should be shower tank.
Close valve & move hose to 2nd grey tank & drain. Our 2nd tank is just kitchen sink.
I don't recommend using any Y fittings, just move the hose.
Something else to keep in mind... We have 2 gray tanks as well. One for the bath vanity and shower and the second for just the kitchen sink. Both of mine drain separately, neither drain with the black tank. After you drain your gray tanks, run a little water into the sinks and shower. The siphon force when draining the tanks can empty your traps leaving a clear path for fowl odors into your camper.