29 U.S. Code § 1412 - Transfers between a multiemployer plan and a single-employer plan
A transfer of assets or liabilities between, or a merger of, a multiemployer plan and a single-employer plan shall satisfy the requirements of this section.
No accrued benefit of a participant or beneficiary may be lower immediately after the effective date of a transfer or merger described in subsection (a) of this section than the benefit immediately before that date.
Benefits under a single-employer plan to which liabilities are transferred in accordance with this section are guaranteed under section 1322 of this title to the extent provided in that section as of the effective date of the transfer and the plan is a successor plan.
 See References in Text note below.