PAI 505134 Piston Ring Set .50 Oversize for Cummins QSB - OEM Ref 4089181 - New

Genuine PAI 505134 piston ring set — one cylinder set, listed on the factory carton as SET, RING, QSB (.5) with OEM reference Cummins 4089181. Made in USA, ISO 9001, with the PAI holographic authenticity seal intact on the box.

Application: Cummins QSB / B-series engines calling for Cummins 4089181 in .50 oversize. The oversize designation and engine application are taken from the manufacturer's carton label and have not been independently verified against a specific engine — confirm your bore size before ordering.

Condition: New in opened original PAI carton. Rings removed only for photography; no installation marks, wear, or corrosion. Not measured or gapped.

Buyer must confirm fitment by part number, photos, dimensions, engine model, serial number, and application before purchase.