Directly buried hard vinyl chloride (Pu-U) grating pipe for ···

Rigid polyvinyl chloride (PVC-U) double-wall corrugated pipe···

Rigid PVC double-wall corrugated pipe is made of P···

Core foamed rigid polyvinyl chloride (Pu-Wu) pipe for draina···

The pipe is mainly made of polyvinyl chloride resi···

Buried polyethylene (PE) pipes for gas

The buried polyethylene (PE) pipeline for gas is m···