And the outer wall is trapezoidal corrugated shape. This kind of double wall corrugated pipe has the characteristics of good corrosion resistance, high insulation, small flow resistance etc. 7178788094934171783-blid-6173805388958225684

#แห่ส่องเลขเด็ด ฅนสุราษฎร์ 1 มี.ค.63 เข้าบ่อยลุ้นต่อเลย

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