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Do NOT even think about solving the problem by installing a one-way valve in the sink drain. It will at least double the time it takes for the sink to drain, easily clog, AND will put you more at risk for accidental sinking with two more hose connections (valve IN and OUT) being below the water line. Best solution…the simple sink stopper. You may not find a "rubber" stopper size to exactly fit, so grind/file/sand one that's slightly too large to get the proper fit.

IMPORTANT: While you are "in there" check to make sure the drain hose is firmly attached to the sink drain. To my disbelief, some sinks come with a slightly tapered drain hose connection AND a slippery surface on the connection (which is made of nylon, I think.) Result…the hose can easily come off, even if the hose clamps are tight. In fact, once I tightened the clamps and, due to the tapered connection, the hose actually squeezed out the nylon connection to the sink!

If anyone else has had this sink hose connection problem, I'd be curious to know how it was solved...as, not paying attention to it could have dire consequences.