These lens mount adapters are designed to fit inside of the OEM lens mount in Mitsubishi LYP and LZP laser cutting systems. The adapter provides a cavity for the Lens Savers® window to be mounted inside of the OEM lens mount, allowing the assist gas pressure to pass between the Lens Saver® window and the focusing lens. This results in the pressure on both sides of the window being equalized. The assist gas passes through holes drilled around the perimeter of the lens mount adapter. This patented pressure equalization system prevents breakage of the Lens Saver window.