what size connecter for the gas intake manifold for my Chambers B?

[Chambers2Be]

Guys-

What is the size of the manifold in the back of my Chambers B? I need to know the measurement to get a fitting to fit the manifold pipe to my standard size gasline flex tubing.

Thanks.

Evan

PS - if there's a place in the manual where it mentions it, please tell me. I pored over it, but did not find it.

[stoveman]

3/4" NPT pipe thread