2 C.F.R. § 1125.332
What method must I use to pass requirements down to participants at lower tiers with whom I intend to do business?
You as a participant in a covered transaction must include a term or condition in any lower-tier covered transaction into which you enter, to require the participant of that transaction to—
(a) Comply with subpart C of the OMB guidance in 2 CFR part 180; and
(b) Include a similar term or condition in any covered transaction into which it enters at the next lower tier.