On Mon, 25 Apr 2005 15:19:51 -0400, Speedy Jim wrote:

stretch wrote:
Use Cast Iron No Hub pipe. It is heavy enough that the water will not
vivrate it, hence little or no noise. Connect it to PVC with no hub
couplings or Frenco Fittings.


The thing you want is mass. I'd leave the PVC in place, wrap in in
whatever soft insulation you can in order to leave it free to
vibrate without transmitting to the outside, and then wrap the entire
thing in the heaviest stuff you can find. Lead flashing would be
perfect.