The Mack And Volvo 2008 To 2018 Injector O-Ring Kit is a practical and cost-effective solution for replacing injector seals in Mack and Volvo models. Made of durable fluoroelastomer, these purple, blue, and black rings are designed to resist damage from fuel, oil, and extreme temperatures. With an ideal fit and long service life, this kit includes 6 injector o-ring replacement seals and 6 injector washers. Quality tested and designed for Mack MP8 engines, it offers original equipment quality at a competitive price. Fits most Mack and Volvo models from 2008 to 2018. Direct OE replacement numbers: Volvo 21261987 and 276948.