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The Vibrant Bosch LSU 4.9 heat sink O2 sensor weld bung is a finned sensor bung engineered to reduce oxygen sensor temperatures and ease welding. Made for Bosch LSU 4.9 sensors with M18 x 1.5 thread, it uses 304 stainless steel construction and an optimized finned surface to improve convective cooling versus a standard bung. It fits only Bosch LSU 4.9 heat sink oxygen sensors.
Vibrant Heat Sink Oxygen Sensor Weld Bung T304 SS (M18 x 1.5 Thread)
