Blow off valve faulty or expansion tank needed at water
heater.
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Don't Blow Your Top - song - was created in 1989.
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Don't Blow Your Top - album - was created in 1988.
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next to the blow off switch
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To break the vacuum that would be created by a tightly fitting
plastic lid on the top of the can. It makes it easier to put it on
and take it off. Plus if the can had a leak the top would blow off
and turn into a projectile.