Expansion tank sightglass replacement

This is the second query about expansion Tank Siteglasses in the past week.
The last one was on an RV-12 with a 912is engine.
What Aircraft and Engine is this one?
What is the Part Number on your expansion tank?

It is Not a Rotax part as far as I know, so it probably is coming from the Airframe manufacturer.
As mentioned in the Other Thread, it does not make a lot of sense to install one.

That said; If it is threaded into one of the Cooling Hose Ports on the expansion tank, it is most likely M18x1.

I read the other thread. That’s what let me know they can come out. I messed up the threads on the sightglass getting it out. It would be nice to have it since it came with it, but I have no problem just plugging it. Hence, the question about thread size. It’s on a 914 in a Magni M24 gyro. It looks like 922 666 is the tank #. And from what I can tell the thread is12-1.25. I just wondered if anybody knew for sure. Thanks. 

Thanks for the Part Number. I found it.
I have not encountered one, even though it appears that the Sightglass has been around for quite a few years.
My installation does Not use the Rotax Tank.
It looks like the Sightglass is considered part of the tank and is not available separately.