Photo might help?
I searched some older threads on Cedar Creek (not Cottage models) and came up with this photo. Some folks said they had the same valve inside under/near a drawer in the kitchen.
It is a push/pull valve.
Often times turning the valve slightly while pushing/pulling helps loosen the stem in the o-rings.(internally)
BTW... Welcome to the forum. I see it is your 1st post!
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2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2024 Ford F-Series SCREW•7.3L•4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
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