Hi

Today is the first day I've had to finish replacing the heater core in my 1991 volvo turbo.

I've decided to do a flush of my coolant (before hooking up the core), and replace the coolant with Zerex G-05.

To flush the system, I have to remove the engine coolant plug. The largest socket size I have is 26 mm. It appears that this is to small (Or I'm looking at the wrong bolt!)

Does anyone know what size bolt this is? I'm thinking 28mm. I don't want to buy the wrong size, and only want to buy that size socket...


Thanks!