For curved tubes 1-1/4"-3-1/2" (32-89mm) I.D. Recommended for removing soft and light scale deposits in curved tubes. Each assembly consists of a single stainless steel wire wheel brush attached to each end of a universal joint. Select tube I.D. for proper sizing.
Note: Brushes should be 1/8"-1/4" smaller than tube I.D. Select tube I.D. size accordingly.
Order GTC-706 coupling if using GTC-720, GTC-721, GTC-721G, GTC-821 fexlible shafts AND your whell brush assembly is 1-7/8" and smaller.