Recirculated cold water which is used in coolers and exchangers shall be obtained from a safe source and protected from contamination. Any freezing point depressant shall be nontoxic. All bottling or packaging machine supply tanks and bowls shall have covers which are constructed to prevent any contamination from reaching the inside of the filler tank or bowl. A drip deflector shall be installed on each filler valve. All conveyors which deliver sterile containers to bottling or packaging facilities shall be afforded overhead protection from contamination. Pasteurized milk and any milk product shall be conducted from one piece of equipment to another only through sanitary piping.