72 Pa. Stat. § 6098
In case of the sale, by any county treasurer, of any unseated tract or tracts of land, for taxes, which may be interfered with by the surveys or titles of other claimants to said tract or tracts, it shall be lawful for any such claimant or claimants, within two years after any existing or future sale, to offer or tender the legal amount of taxes assessed upon so much of the said tract or tracts of land, as shall be included within the lines under which said claimants claim or hold title, and of the cost, together with the additional fifteen per cent on the same, equal to the proportionate part so included within the liens of aforesaid, to the county treasurer, who is hereby authorized and required to receive and receipt for the same, and pay it over to the purchaser, on demand; which said redemption shall be as effectual, for the protection, to all intents and purposes, of said claimant or claimants' title within the lines of his survey or claim, as if the said redemption had been made for and included all the land within the lines of said interferences; any law, usage or custom to the contrary notwithstanding.
72 P.S. § 6098