How to use snorkel with purge valve ?

Having learned to dive late in life I made up for it in my first year by clocking up 120+ open water dives in places from the UK to Australia. I went from a non diver to a technical deco diver in 9 months and loved every second of it. Since having kids not been able to travel as much so spend my time watching videos and reminiscing, hope you enjoy my site as much as I have making it.