Filterqueen, to my knowledge, has never used a telescoping wand. Their's have always been one piece. At least on the five i own, one is the brown, which uses a one piece S curved wand.
It's just a generic wand. They are used all over. Check with Centec. I thi k early 2000s Shark used them for their canisters. It seems like a lot of unknown brands will use them.
It's not Rainbow. Rainbow has specific wands that they have to use. I know that a Vacuum Cleaner shop has tried to use them on older model Rainbows and you can see it on their videos. But the wands do not fit properly into the hose or powerheads.
Looks like a generic wand often sold at vacuum stores for use with 1 1/4” attachments. I’ve seen many of these often included with Nutone or other brand central vacuum setups. Some used on sharks and LG or even Royal canister machines They are nice because of the infinite adjustability in length and if one has a need to cart a canister vacuum around from house to house like a cleaning service or home repair person that needs to clean up after themselves like me, this type of wand is very convenient that it shrinks for easily getting into the car and not having to break down into two pieces like traditional wands. Sometimes however, they are more prone to clogging in the area where the two pieces come together as the inside narrows. I’ve had three of these, all slightly different in design.