... voltage unstable environments. It’s our patented design prepared for export.Technical parameters:length:1000-5000mmInner diameter:200-3000mmJoint: ... Concrete mixer,we also produce JS750,JS1000,JS2000 etc5,Automatic welding machine6,Our concrete pipe making machine areas,welcome ... of concrete pipes?9, Any other requests? the whole production line flat joint reinforced concrete pipe for drainage project