... unstable environments. It’s our patented design prepared for export.Technical parameters:length:1000-5000mmInner diameter:200-3000mmJoint ... also produce JS750,JS1000,JS2000 etc5,Automatic welding machine6,Our concrete pipe making machine areas,welcome you to here~~~7 ... the following informations, thanks for your cooperation.1, the pipe length2, the pipe inner diameter3, the pipe joint, flat, socket or ...