Yes so i have 20 pipes of stainless steel wich diameter is in metric size they are thin walled fir there normal use is for gas exhaust of gas fireplaces
I pack them then trow em in the freezer packed
I use Thermo sientific. Freezer Wich is 45" high inside so the tubes are made to fit the freezer
then blast them out once put back in the freezer turn them upside down and blast again to get the last bit out
Works for me
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