drainage cap 1,WORTHY OF TRUST 2,all types to choose 3,professional production drainage cap 1.Ø20X13 wintersweet type,including long,middle and short lenth2.tower type water draining cap3.piece material type water draining cap specification:250kg-DN15 500kg-DN23,DN25 1000kg-DN32 properities:high mechanical strength,good stability in pure water usage: Drainage caps are widely used for rough ...