A BP/W is just another kind of BC. You can use whatever regs you want with it.
I use a Mk17 with two G250V seconds (or a G250v with a S600; or a R295/S555 depending on which set of regs I'm diving).
I use a Mk17 with two G250V seconds (or a G250v with a S600; or a R295/S555 depending on which set of regs I'm diving).