@davidhookahdive: Hookah diving ventilator LY700 tumbler performance test in our Lab. LY is the PRO series of our production line for LIEYU diving ventilator. We did have developed a more economic version Z series with slightly slim body which the tumbler performance is not as good as our LY series and the pump rate we used are different as well. So unlike any other sales, I normally would ask for your diving habbit and diving scenarios before suggesting our hookah diving products for you. Diving is a risky game, so it is with the hookah diving ventilator selection. The professional people would always clearly pass on the product performance for you to avoid any foreseeable risks. PM me if you are interest. I am sure my professionalism would impress you. #hullcleaning #tiktokhotshots🔥 #scubadiving #spearfishing#treasurehunting