Dry Cleaning Part 401880/MTP is a Viton gasket for still sight glass and recovery head inspection glass service on compatible dry cleaning machines. The gasket measures approximately 155 mm diameter by 5 mm and cross references G15976. It is used on many K Series, F Series, Ecogreen, Omnia, Vortex, Axial, Western Automation, Union, Realstar, and related machines where the original gasket dimensions match. Confirm diameter, thickness, glass assembly, solvent compatibility, and machine fitment before ordering.