Diameter: S60x6 Closure with valve Outlet: S60 x 6 male, standard outlet for tank valves 1000 liter IBC/GRV tanks are all equipped with a lower male threaded outlet where a drain valve is screwed. It is therefore advisable to take the measurements of this outlet on your tank before purchasing any valves. To take the measurements correctly, it is a good idea to first equip yourself with a caliper, or failing that, a meter. The dimension D1 corresponds to the OVERALL diameter of the male outlet, and the dimension P1 to the spacing between two threads if: D1 = 60mm P1 = 6mm then your tank has an S60x6 outlet, you will need to buy a replacement valve with an S60x6 nut to make it compatible with your tank Sold by the grid cool store