Technic Round Engine Piston – 2851

Build or repair a LEGO® Technic engine mechanism with round piston part 2851. This compact cylindrical component has a hollow opening and a small side hole, with a raised rim at one end. It is designed for compatible Technic engine assemblies and moving mechanical builds.

Round Piston for Technic Engines

The distinct barrel shape makes part 2851 useful when restoring an engine assembly or selecting parts for a custom mechanism. Check your model instructions for the exact piston design and colour before ordering.

Available in Black, Blue, Bright Light Orange, Dark Bluish Gray, Dark Turquoise, Red and Yellow. Each purchase is for one piston in the selected colour, not the separate 20-piece Yellow lot pictured. Browse more LEGO Technic parts for related building elements.