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Post 1990 machines, Includes: (1) EM14818 4” ball - (1) EM14817 Ball Seat 4” - (4) EM18801 O-Ring - (6) EM968266 Nut - (6) EM618 Washer —(6) EM18409 O-Ring - (3) EM136 Ball Stop - (1) EM18804 4 1/2” Ball - (1) EM14842 Ball Seat. C30HD prior to 1990 require EM18803 to replace EM14842