23 mm intake manifold insulator spacer for 125cc GY6 QMI152/157 and 150cc GY6 QMJ152/157 engines Smooth on both sides Description 23 mm intake manifold insulator spacer for 125cc GY6 QMI152/157 and 150cc GY6 QMJ152/157 engines. Smooth on both sides. Please check the dimensions on the Specs tab to see if this is the correct intake manifold insulator spacer for your Chinese built 150cc or 125cc GY6 QMI152/157 QMJ152/157 engine. WARNING California Residents : Proposition 65 Warning Specifications Smooth on Both Sides No O-ring Bolt Hole Spacing: 45 mm Inner Diameter: 23 mm ,Reviews 5 out of 5 5 Star 4 Star 3 Star 2 Star 1 Star Ian W February 10th, 2021 Love it