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The Graco 24T258 Check Ball Kit includes the 3/4 in. inlet check ball (Ref. 101) and 9/16 in. outlet check ball (Ref. 103), both made of 316 stainless steel. It also requires selecting the correct o-rings (Refs. 104, 105, 106, 107, and 108) based on your pump model. This kit fits Merkur Bellows LB100A, LB100B, LB100C (acid), LB150A, and LB150B pumps.