The EcoTech Marine Thin Spacer for the MP40wQD is a replacement part designed specifically for the QuietDrive version of the MP40 Vortech Pump. This thin spacer is intended for use with aquarium glass thicknesses greater than 1/4" and up to 1/2" (6–13mm). It ensures optimal magnetic coupling between the dry and wet sides of the pump, maintaining proper alignment and performance. Ideal for tanks with mid-range glass thickness, this spacer helps secure the pump in place while minimizing stress on the glass and equipment.