For the purposes of this chapter, a nonprofit cooperative association organized and existing under Chapter 1 (commencing with Section 54001) of Division 20, that acts for producers, including members and any nonmembers of the association, to whom it accounts on a patronage basis, is a handler in any transaction which involves the receipt by it of market milk from any person other than a producer to whom it accounts on a patronage basis and in any transaction which involves the pasteurization of bulk market milk or the packaging of it in bottles, cartons, dispenser cans, or other consumer packages, or the sale or delivery of packaged market milk.