M18 x 1.5mm Inner Hex Head Sensor Blanking Plug Cap 304 Stainless Steel 5 Pack5 Pack 304 Stainless Steel M18 x 1. 5mm Inner Hex Head Sensor blanking Plug Cap Features: The screw plug is used for exhaust systems and removing the L probe for sealing when conversion work is carried out. Blocks off a lam b da sensor port when not needed. M18x1. 5 standard thread pitch fits universal lam b da ports bungs. Easy to screw in, no welding required. 304 Stainless Steel prevents corrosion. Create a tight seal to prevent any leaks. With 5