There’s a “gotcha” when you use some of these plumbing fixtures you can find on Amazon, but never see in the local HD or Lowe’s. They're metric.
In the case of this particular faucet, the fittings at the ends of the hoses are very close to 1/2”, but they’re straight threads rather than NPT. The nipple needs to screw into it far enough that it seals against the flat washer inside.
If you try to couple it with any metallic fitting, it will bind up almost immediately. If you use a plastic fitting, the threads will deform just enough that it will screw together and make a seal. It’s a minor issue, and I was able to install it without making any changes to the camper plumbing that would make it difficult to install a standard USA type faucet.
I’ll get the QC33T fittings I need either from Amazon or somewhere else. It’s apparently not a very common fitting because the local HD and Lowe’s don’t have it, even though they both have an extensive assortment of Zurn Pex fittings.
:):)