53 Pa. Stat. § 23655
A member of the fund, who has severed his connection therewith and has subsequently again become a member thereof, shall be required to pay a re-admission fee of $5.00 and to return to the fund, such monies as were paid to him from the fund when his membership in the fund was terminated with interest at the rate earned by the fund during the period.
Such re-admission fee and refund shall be collected from the monthly salary or wages of the reinstated member over the period of a year, in the manner provided for in sub-section (1) of section 10 hereof, or in such manner and period as the board of managers may determine. Full payment thereof shall be a condition precedent to the member being eligible to receive the benefits of the fund.
If, however, any such reinstated member shall be totally and permanently disabled in the line of duty before he shall have made such full restitution, he shall be eligible to pension under this act; but any amount, in which he shall have been indebted to the fund at the date of his injury, shall be repaid, if the board, in its discretion, shall so require, in such monthly payments as said board may determine which amounts shall be deducted from his pension, as and when monthly payments thereof shall be made.
53 P.S. § 23655