“Smooth-line 2” series threaded cover with fixed labyrinth vent "GHIBLI"
The path of the valve vent labyrinths is It was created to allow for easier passage. ample of air and at the same time reduce the loss of liquid from the tank. Made according to current anti-pollution regulations, it is equipped with a double vent valve unit that allows rapid emptying of the tank with the lid closed even with a high-capacity pump.