41 C.F.R. § 105-68.435 What must I require of a primary tier participant?
Title 41 - Public Contracts and Property Management
You as an agency official must require each participant in a primary tier covered transaction to— (a) Comply with subpart C of this part as a condition of participation in the transaction; and (b) Communicate the requirement to comply with Subpart C of this part to persons at the next lower tier with whom the primary tier participant enters into covered transactions.
Title 41: Public Contracts and Property Management
PART 105–68—GOVERNMENTWIDE DEBARMENT AND SUSPENSION (NONPROCUREMENT)
Subpart D—Responsibilities of GSA Officials Regarding Transactions
§ 105-68.435 What must I require of a primary tier participant?

