(A) Except as specified in (B) of this section, copper and copper alloys such as brass may not be used in contact with a FOOD that has a pH below 6 such as vinegar, fruit JUICE, or wine or for a fitting or tubing installed between a back flow prevention device and a carbonator. (B) Copper and copper alloys may be used in contact with beer brewing ingredients that have a pH below 6 in the prefermen