Średnica / Nominal diameter

•  3" (70mm) (1)
•  4" (100mm) (3)
•  5" (130mm) (1)
•  6,5" (165mm) (8)
•  8" (200mm) (9)
•  10" (250mm) (15)
•  12" (300mm) (18)
•  15" (380mm) (20)
•  18" (460mm) (17)
•  21" (530mm) (6)