In a message dated 2/26/02 2:39:33 PM Eastern Standard Time, sr20de@epix.net writes: > I believe 10mmx1.25 if you need I'll dig for my tap but I'm > almost posistive thats it. That or 12mmx1.25 The thread is a 14x1.25. same as spark plugs. Might be hard to find in the hardware store. If go to your local parts store pick up a no foul out spark plug bung. or msd and dynomax sells the bung too. John NISMO SE-R