Cheap And Discounts 5pcs 3/4 NPT Female Aluminum Exhaust Pipe Base Heat-resisting Nut Exhaust Oxygen Sensor Weld-On Nut Wholesale. Buy Directly From Merchant GUBANG-Autoparts Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.