Sailfish - what is this ?

[Legend]

The cockpit fresh water spray handle has a black string with a black square piece of plastic attached to it - must have a purpose because it was on the original spayer and is on a new one I just installed -thanks for any insight

 

[Motivator]

I use it to pull the nozzle out of it's compartment.

 

[NOTHING ELSE MATTERS]

I use it to pull the nozzle out of it's compartment.

X2, that is what for.