The diffuser itself is crooked in its housing, and the material feels like hard plastic rather than aluminum. If it really is aluminum, it is the thinnest grade I have handled in a long time, and I say that as someone who's background is Steel manufacturing.
I appreciate the information about the check valve. I actually have a separate check valve that I removed during the installation of this diffuser.
The diffusion performance itself is fine; my gripe is with GLA’s recent material choices and quality control. A friend of mine, in addition to the other person who posted here with the same purchase, bought the “high-grade SS” filter tubes and received brushed, unfinished stainless steel. The outflow was also a completely different product from what was advertised. This is the third problem I have seen with GLA items in the past month or so, all surrounding a single product.
I am not trying to rant, just providing context. GLA used to carry excellent products that matched the quality you expect for the price, but lately that just has not been the case.
Here are the tubes in question:
Product:
View attachment 10295
Friend Received:
View attachment 10296View attachment 10297View attachment 10298
Even mine came mis-manufactured (as documented previously)...
This concludes my rant... sorry haha!