。PVC，PVC。，。。，，。，4PVC、 pvc suction hose pipe 4 inch .。，PVC，，。，8mhipneumatic tubing materialgh pressure pneumatic hoserong>high pressure pneumatic tubingm vacuum hoseflexible pneumatic tubing，。、，。PVC，。，，，PVC，，4PVC，。，。，8high pressurepneumatic tubing materialrong>high pressure pneumatic hose pneumatic tubingmm vacuum hoseflexible pneumatic tubing，。PVC。，，PVC（），4，、。，PVC，。、。PVC。