SMART-O R9 Oil Drain Plug 1/2 - The plug comes with Series of smart features, benefits, high-performance sealing technology, patented anti-leak and anti-vibration mechanism Anti-leak and Anti-vibration function: seals the oil pan from the inside and counteracts vibration. The high-tech O-ring material expands upon contact with engine oil. Engine and Oil Pan Protection: the seal and anti-vibration mechanism reduce risk of engine damage due to catastrophic oil loss caused by loss of drain plug. The special alloy exerts less wear on threads. Faster installation: the SmarTorq simple and unified torque setting system and quick plug identification system allows a more effective working process. Re-usable: the plug can be reused multiple times. The same goes for the robust O-ring which is a permanent seal saving cost for new gaskets replacement with every oil change. Eco-friendly: reduces risk for oil leaks, less material waste due to re-usable seal, black coating is free of harmful Cr6, so parts can be easily recycled.