They are the original Marmite wand.
i absolutley love mine, i can clean any
carpet at 500 Psi if i wish, without any
overwetting problems. Most carpets you
can clean with one hand, it's that easy.
Mine's nearly 5 years old and in that time
i've replaced the valve once. Stainless steel
jets have not worn out but i did pinch a jet seal
once so replaced that.
it takes about a month to really get used to it,
as it moves over the carpet so easily, you find
yourself thinking it's not working properly. this
is why it takes a little time to adjust to it.