replying to Steve, Rickyd61 wrote:
A much easier way, I have found,although depending on how blocked your whistle
is, is to switch the hose on your shopvac so that its blowing, not sucking,
and alternate blowing air down the vent,and fill pipes alternately. This may
free up the obstruction. This has worked for me in the past, and also not
worked,again, depending on what's obstructing the whistle. Good luck


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