The association and its members may make and execute marketing contracts which require the members to sell, for any period of time, but not over 15 years, all or any specified part of any product or specified commodity exclusively to or through the association, or any facilities which are created by the association. If they contract a sale to the association, title to the product passes absolutely and unreservedly, except for recorded liens, to the association upon delivery or at any other specified time which is expressly and definitely agreed in the contract.