These have no other markings on the package. These appear to be a general replacement NVA because neither nuts are fixed so you have the ability to adjust the orifice position. With the nut on the inlet side bottomed against the end of the threads, the orifice was about 1/8" or more off-center. After a flight or 2, I'll run some purple locktite onto the nut on the needle side.
It looks like it would be difficult to make an NVA with the nut only on the inlet side because, as you can see on this one, there's no "nipple" to speak of because you couldn't get a nut started from that side and most spraybars are smooth in the venture open area whereas this one has threads across it. I don't see that as an issue, myself. The fuel line fits very snugly on the inlet but I did add a clamp.