I am in search of the harman appliance adapter for duravent pellet vent pro. It is part number 3pvp-Adhb. I have ordered it twice and was refunded my money and ive been waiting for a call back from northline express for hours. This is the very last peice for my install and it seems like its impossible to get. Is there anyone who has a stove shop that's has one of these and would like to make a sale?