The trigger was made as simple as possible just to save a bit of water, in the vid it was connected to van mount , i use normal on off tap (red wing nut type) , once the pole hose is looped and nipped i then stand on the tap to switch it on , from then on i use the trigger as needed , when done i hold the trigger until i go and switch the tap off.
When doing high windows its the same , nip the hose while you lower the pole , a loop is formed sadly , but you can re nip the hose if you want to get rid of the loop .
It basically saves you water from window to window and when lowering the pole or going and shutting the tap off , its an eye opener how much is wasted this way .
Rich