i'm at my wits end here! i am trying to deal with these ancient shut off valves in the ladies bathroom that are of the type that can only be shut off with a flat head (some call them standard) screwdriver. no lever or tap to turn. i'm assuming they were installed at the birth of the bathroom 35 years ago. rusted shut with no possibility of loosening them. i've tried heating them up, chemical looseners, grinding a better groove so i can get better leverage with my screwdriver, to no avail. i'd cut them off and start again, if i wasn't worried that shutting off the main would affect other components of the building. it is a mom and pop hotel outfit, here. my first question is, what the heck is the name of this confounded valve, and second, what is the solution to this. shark bites, maybe?