ITEM NAME:O2 Weld Bung Stainless Steel Description: M18mm-1.5mm X M12mm-1.25 thread, Adaptor needed when installing the new style M12mm-1.25mm O2 sensor in larger M18mm bung Application: fits all late model O2 sensors in American, Japanese, European, cars, trucks, HD motorcycles All items are Brand New unless stated otherwise on the listing. We sell DIY (Do It Yourself) Items with a few exceptions. We take no responsibility in teaching you how to install. Professional installation is strongly recommended. Specification: Material : stainless steel Package Includes: 1x O2 Weld Bung Adapter SKU: DMO0018836452036200.M18mm-1.5mm X M12mm-1.25 thread, Adaptor needed when installing the new style M12mm-1.25mm O2 sensor in larger M18mm bung. 1x O2 Weld Bung Adapter. Material : stainless steel. SKU: DMO0018836452036200.