The new'er HALOs (post 09) I think, will take A1, A2, VORTEX, BC2.0,
I use the A1 with no peel washer, or a VORTEX, the one thing I like about the VORTEX/HALO is it will only go on in 4 positions, it kinda clocks its self... The HALO is a little heavy, but its a good can.

