This time the shower won't drain

[jlb27537]

On our summer trip to Colorado, first week went great...

This morning the shower will not drain. Got one of those rubber flapper things in the line. Will try and borrow a plunger from the campground.

What if that does not work, could you get the water hose from outside and pressurize the drain and "blow" it clear and then take the rubber thing apart?

Or some Drano, safe for plastic. Since the plastic thingy is horizontal, I doubt the Drano would reach it.

The bath sink drains just fine.

Thanks Jim