47:15 If a Jew makes kosher wine to sell to other Jews, but it belongs to a non-Jew, there are a variety of issues and even two seals plus a lock may not be a sufficient sign. In such a case, an authority must be consulted for direction. It is certainly advisable to avoid such wine.
47:16 Regarding containers of non-Jewish wine, if they are only used to hold wine for short periods of time and the non-Jewish wine was only held in them for 24 hours, then they should be washed thoroughly with water three times, after which they may be used. This is true whether they are vessels of leather, wood, glass, stone or metal, so long as they are not lined with pitch. If they are lined with pitch, different rules apply; different rules also apply to earthenware.