Check the listing for details. 4Pcs M16x2 Carbon Steel Inner Hex Head Pipe Fitting Plug with O-Ring. Condition: New. Listed at 14.54 USD. Description:Material - The threaded plugs are made of carbon steel with good strength and hardness, which has good heat resistance, anti-rust, anti-corrosion, and anti-oxidation performance. Its unique structural design enables it to withstand high pressure and ensure long-term durability, suitable for both indoor and outdoor environments.Good Sealing Effect - The Hex countersunk plug ensures the firmness and stability of the electrical connection. It can be used to seal the exhaust system and ensure a good sealing effect through the O-ring(Included), effectively preventing air, steam, gas and water from leaking out of ports, thereby ensuring the good performance of the engine.Easy to Use - The pipe fitting plug has a precision-designed thread that can be easily replaced and installed without special tools.