I am in the process of installing a shower filter, and am encountering a challenge where shower head and water pipe are not NPT.
The shower pipe has a slightly larger female "wrapper" (apologies as I lack the correct vocabulary. I am holding said "wrapper" in first pic, below. It attaches to an oversized male connector, which cannot allow me to attach the shower filter, see 2nd pic.
is there another less popular standard than NPT that some showerhead makers are using?
if so, do adaptors exist that would allow me to connect one to the other?