These are pictures of a numatic trigger on my mini pole. I also have one fitted on my other pole i use daily. The loop so i can fully extend to the max is only about 4-5, meaning about 8-10 of pipe if laid out flat.
It took about 3 days to get the nack of using the trigger & get used to the loop, i dont even notice the loop while i'm working now.
I would recommend the trigger any day, saves loads of water. At the touch of the finger water, release the trigger & its not wasted.