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No, not really.
The flush is what you do immediately after your dive so as to prevent the buildup of crud in the inflator.No, not really.
That *might* work but fresh water alone is unlikely to shift the salt/corrosion build up that is causing the problem.
Since a stuck inflator can really, really ruin your day, why take a chance?
It really needs an overhaul or replacement (cheap fix).
Suggest avoiding the overhaul and just install a new cartridge or entire assembly. Better to do that before a problem occurs (annually or before a trip). I had a rash of sticking inflators a few years back and swapped out all cartridges ($12-15 each). I initially tried servicing the cartridges but found the fixes didn't last and the sticking came back over time. Since then, I remove the cartridge after every dive day and soak them in fresh water for a few minutes as a prophylactic measure. I do that even if I'm not flushing the bladder. I also carry a couple of spare cartridges on every trip. Cheap insurance and a good reason to use the standard "K" inflator. No reason to risk injury over a $15 part and thirty seconds of maintenance.It really needs an overhaul or replacement (cheap fix).
Or warm water and white vinegar....Buy a replacement and just change it, take this one and toss it in a bucket of hot water with a little dish soap and work the buttons every few days for a week. Now hook up the air supply and drop it back in the water, if it bubbles throw it out is not put it in a baggie with some zip ties and you have a spare.