I am replacing an existing gas dryer with an LG DLGX3371W. I have replaced many gas appliances in the past. I removed the protective plastic cap from the 3/8 inch gas supply nipple on the dryer. I found a white greasy silicone like material blocking the inlet. First, what is this and is it supposed to be there? Second, what should I do with it before connecting the gas supply line? Should I remove it?