The gopart 81512GP Piston is a premium aftermarket component designed for various Perkins engines and compatible Massey Ferguson tractor models. This piston is engineered to meet or exceed OEM specifications, providing a reliable and durable solution for engine rebuilds or repairs. It directly replaces Perkins OEM part numbers 81512 and U5LL0006. Key technical specifications include a bore diameter of 91.44 mm, an overall length of 106.6 mm, a chamber diameter of 49.2 mm, and a pin diameter of 34.9 mm. The piston is equipped with ring widths of 3.175 mm, 2.38 mm, and 4.76 mm, ensuring proper sealing and compression. With a weight of 1.15 kg, this gopart piston is a cost-effective alternative to genuine parts, maintaining engine efficiency and longevity.