Aldi does a single cylinder one that looks like the SCA one that looks like ........(insert name here). Most come from China and judging by how similar they look probably come from a couple of factories with the differences are down to the colour and name on the sticker.

I have a truck brake air cylinder that I filled when airing back up. Hardly worth the trouble as you still have to wait for everyone else.

ARB design is different. There are plenty of choices of brands but i’d say only about 1/2 doz designs.