Pennsylvania Statutes Title 75 Pa.C.S.A. Vehicles § 1733. Priority of recovery

(a) General rule.--Where multiple policies apply, payment shall be made in the following order of priority:

(b) Multiple sources of equal priority.--The insurer against whom a claim is asserted first under the priorities set forth in subsection (a) shall process and pay the claim as if wholly responsible. The insurer is thereafter entitled to recover contribution pro rata from any other insurer for the benefits paid and the costs of processing the claim.