My hoses all came with brass quick couplers and nipples. One of them froze up - I think it was from SH? Anyway, I switched to stainless quick couplers - I think the nipples are zinc. After just one use I was having problems - difficult to detach, o ring destroyed immediately.
I just keep the brass until they die than always replace with stainless and only stainless, I always rub a small amount of petroleum jelly in my couplers to keep them lubed up and it works great.