Overfill prevention valve suitable for UST or AST Installation, alluminium or stainless steel, dimensions 3" or 4", capacity 93 lt/min - 1000 lt/min, delivered with lower or upper pipe. gravity or pumped fill 4 bar. Valvola limitatrice di carico a pompa 4 bar o per caduta, 93 lt/min-1000 lt/min, con tubo inferiore e superiore, 3" o 4".