repair

Hi, Does anyone know what is the string that goes through my Mares BC corrugated hose for? I was going to replace the original inflator with this one but found the string inside. Looks like the other end of the string is connected to the valve on the shoulder. But what is it for and what shall...

Hi. I am staying in Singapore. Recently I purchased a second hand pair of force fins. Not sure if its Extra or Accelerating. Those things have bat wings on! How awesome is that!! Can anyone give me the exact model and maybe the model year of this beauty? So yeah, the problem is next, after a...