NPR American V8 Engine Ring Series Piston Ring Set - 4.155 in Bore - 1.5 x 1.5 x 3.0 mm Thick - Standard Tension - Nitride - 8-Cylinder GRE7107 Two 1/2 in NPT Female

Two 1/2 in NPT Female Auxiliary Ports

2001 - 2015 BMW 320i

Pink high pressure spring (M-55A)comes installed with the lower pressure yellow spring (M-55) also included

Flat-Top Cap Design

NPR American V8 Engine Ring Series Piston Ring Set - 4.155 in Bore - 1.5 x 1.5 x 3.0 mm Thick - Standard Tension - Nitride - 8-Cylinder GRE7107 Two 1/2 in NPT FemaleProduct Description: Piston Rings American V8 Engine Ring Series 4. 155 in Bore 1. 5 x 1. 5 x 3. 0 mm Thick Standard Tension Steel Nitride 8 Cylinder NPR Piston Rings is a world leader in the production of piston rings. A long time supplier for OEM applications, they also produce a line of performance piston rings designed for top tier performance and reliability. With performance piston rings for a wide range of engines, including popular V8's from