Yes, just unscrew the one that comes with the product, although it’s not bad, better than the one I had previously as it’s a large diameter spray head.
You could use a diverter valve if you wanted both an existing shower head and this wand.
it acts like stainless, based on the spark test when grinding. I did cut mine down by about six inches. Plastic plug in the end that is easily removed and reused.
I wouldn’t recommend cutting the tube. It’s plastic and I could see it chipping, plus there are plugs that insert into each end to finish it off.
In order to be flexible the hose is rubber and is able to articulate as needed
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