Hey all Happy 4th to everyone. I have a 00 EX with a coolant leak. I do know where the leak is occurring, however I am stumped on how to stop it. Let me explain. Where the lower radiator hose connects to the engine there is a gray flange with a short pipe that you clamp the lower hose to. The leak is occurring where the flange meets the engine block. The flange has two bolts that connect to the block. When I pulled it off all that it had was a big o ring that hugs the flange pipe and supposedly seals between the engine block and flange. Does anyone have any ideas where I would get a new o ring like this? I have checked auto zone, Napa and no luck. Do I need to add some rtv sealant along with the o ring to get a proper seal or is the o ring all I need? Thanks again for your help!