74 Pa. C.S. § 1767
Bonds issued under this chapter are hereby made securities in which all public officers and the instrumentalities and agencies of the Commonwealth and its political subdivisions, all insurance companies, banks, bank and trust companies, trust companies, banking associations, banking corporations, savings banks, investment companies, executors, trustees, the trustees of any retirement, pension or annuity fund or system of the Commonwealth and other fiduciaries may properly and legally invest funds, including capital, deposits or other funds in their control or belonging to them. These bonds are hereby made securities which may properly and legally be deposited with and received by any Commonwealth or municipal officer or any agency or instrumentality or political subdivision of the Commonwealth for any purpose for which the deposit of bonds or other obligations of the Commonwealth now or may hereafter be authorized by law.
74 Pa.C.S. § 1767