... steel cages with white PVC trough, ball valve automatic drinking equipment, white PVC water pipe, 3MMu steel galvanization shelf and ... galvanization, it has a 15-year lifespan.5. ball valve automatic drinking equipment: 360°all-round rotating design with large ... . Smooth movement of hopper trolley, even & smooth feed distribution; 5. Cost efficient feeding, drinking and labor saving system; 6. Easy ...