It was not a hook, but a nail part way up on left side of window frame which was painted white.
As I got older I wondered about it.
Knew sis and I had gotten enemas, wish I could remember more.
Recall when taking a bath, sometimes the red/orange or black Armstrong Art Weave Hot Water Bottles
were drying. Nothing was mentioned, unless it was your turn.
The thin black corrigated rubber hose had a combination stopper, the other end was a black adult rectal pipe.
Plus the cheap metal clip.
The floor was black and white tiles, plus tiles 1/2 way up the walls.
My enemas were in bed, except once had fever, was lying on green rug in front bathroom sink.
One end of hose was in cold faucet, the other end up my fanny.