PVC，PVC。，。4，PVC（），。。4PVC、，PVC。，。，、。，，pu pneumatic clear pvc tubingtflexible clear tubeubflexible clear pvc pipeeclear pvc suction hose，，PVC。PVC，。。。、，。、，。。4PVC，，。pu pneflclear pvc tubingexible clear flexible clear tubepvc pipeumaclear pvc suction hosetic tubePVC， pvc suction hose pipe 4 inch .PVC，，。，，。，，PVC，，，，。