I don't think it would be a problem, but i'd wait for a grown-up to give you a better answer. i know when i have mine apart i made an adapter so i can hook a water hose up directly to the water intake tube and when i pull the t-stats i flush out those holes, but hever have done the poppet valves.
one thing i have found out is t stats open a different temps. over the years i have a coffee can full of old ones( why i keep them, i do not know). i threw them in a pot of boiling water to open them up & while they were open i stuck a piece of fishing ling in each one and let them cool. then i took them and hung them in a pot of cold water and started heating it up. i used my laser thermometer to check temps and some started dropping @ 120 on up to 180 degrees. now when i put new ones in, i check them to see if they are opening about the same.
sometimes i think i have too much free time
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