It specifically says 1 1/4" npt
I have found some tri clamp to 1 1/4 adapters online but they are about $150.00. WOW!
I assume its due to being a custom to-order product.
I am thinking that apping a whole into a tri clamp cap prob wont work due to not having room for the triclamp or enough threads
Do you think if i bought the item you have and then have it drilled out to 1 1/4 npt would work?
Maybe ill stop by a local welder and see what they say.
Thanks for the pics mateob, thats a pretty badass setup!