I'm renovating my kitchen, and removed the existing soffit so that I
may extend height of my kitchen cabinets. I discovered that there is
a PVC waste pipe that drains water from the upstairs bathroom.Before I
finish of the top of the cabinet with crown moulding, I would like to
deaden or minimize the sound of 'swooshing' water each time the toilet
is flushed or the sink is used. Can anyone recommend a solution or
approach to eliminating this sound? Is there a type of wrap that may
be placed around the PVC?

TonyM