，PVC，，。。、。 pvc suction hose pipe 4 inch .。。。PVC。，，、。。。pu airsteel pvc pipe tuducting hosebebulk vacuum hosevacuum insulated tubing manufacturer。PVC（），。，PVC，4，、。4PVC、PVC，PVC。PVC，，，PVC。，，pu airbvacuum insulated tubing manufacturerducting hoseong>ulk vacuum hosesteel pvc pipe tube。，，，PVC，，。，，，4PVC，，，，。