Circulating Pump Drain Plug Size for 2003 Excalibur 330

[Peter Wake]

Hi

I lost the drain plug for the circulation pump on my 2003 Excalibur 330 in my SAN. The parts manual said I needed a 1/4 inch - which turns out to be too big. I have tried a 1/8 inch and can't get it to thread.

Does anyone know what size drain plug I should use?

Thanks for you help.

Peter