... 4.long service time 5-section RZ-shaped boom, with wide placing range and no dead angle; X-shaped ... directional control impact and high reliability;Automatic retraction of concrete piston makes it easier to check or replace ... prompted; multiple automatic protections are provided.Our 43M Truck-mounted Concrete Pump class includes SY5310THB43B, SY5310THB43R, SY5310THB43V, SY5313THB43, SYG5310THB43V ...