Camlock connector, female camlock to 5/8" barb, high flow
This stainless steel high flow connector is commonly used on the mobile side, connecting directly to 1/2" ID hose. It has a larger internal bore for faster movement of liquids. Note that friction closing most camlock fittings is common due to manufacturing tolerances, but reduces with use.
Barb measures 1/2" ID, 5/8" OD, but the manufacturer indicates that 1/2" ID vinyl tubing will fit, snuggly, if softened before connecting.