Model : 
ACS 150  , 150MM diameter  ,  cab be used for C6,C7,CURVE 7,HERO7 skimmer

ACS 200, 200mm diameter, can be used for C9 ,curve 9 ,hero9 ,BM200E skimmer

ACS250, 250MM diameter ,  can be used for BM250,BM320,BM350,HERO77 skimmer

ACS300 ,300 MM diameter , can be used for C99,BM460,BM360E,BM460E,BM560E skimmer


Clean head also can be used for another brand skimmers ,if the neck diameter is same as mine  ,it can be used for it  .