7 Pa. Code § 59a.333
Collectors must be made of stainless steel or equally noncorrosive material and constructed to facilitate cleaning and inspection. Filter sack collectors, if used, must comply with the current 3-A Sanitary Standards for Bag Collectors. Conveyors must comply with the current 3-A Sanitary Standards for Pneumatic Conveyors for Dry Milk and Dry Milk Products or the current 3-A Sanitary Standards for Mechanical Conveyors for Dry Products.
This section cited in 7 Pa. Code § 59a.326 (relating to equipment and utensils).