... , 20*20 , 22* 22 , 23* 11 , 23 *23 , 24* 12 , 24*24 , 25*13 , 25*25 , 28*28 , 30*15 , 30*30 , 30 ... )7.5*11.5,9.6*15,10*20,13.5*18.5,13*23,10*25,14.5*21.5,15*28 ... ,15*30,13*33,20*30,15*38,15*42,20*40,13*44,25*38,28*42,25 ... *49,28*45,30*45,20*50,28*57,35 ... ) Flat oval pipe : (mm)8*5,10*20,10*24,11*24.5,13*22,12*23,12*24,15*25,15 ...