Section 5 - HVAC Hydronics & Backflow GRUNDFOS CIRCULATOR PUMP CONNECTIONS Replacement Gaskets Replacement Gaskets for GU 125 Grundfos GU 125 Union Gasket (2 Pack). Cat. # 45386 OEM # 99886874 Description Gasket (2 Pack) Replacement Gaskets for GF 15/26 Grundfos GF 15/26 Nut Bolt And Gasket Set (2 Pack). Cat. # 45387 OEM # 519610 Description Nut, Bolt, and Gasket Set Replacement Gaskets for GF 40/43 Grundfos GF 40/43 Gasket (2 Pack). Cat. # 45388 OEM # 99880243 Description Gasket (2 Pack) Replacement Gaskets for GF 50 Grundfos GF 50 Gasket (2 Pack). Cat. # 45389 OEM # 99880042 Description Gasket (2 Pack) 5-66H PHONE 800-772-2347 FAX 800-991-6275https://www.markspp.com/Catalog/Detail/254258?keyword=45386 https://www.markspp.com/Catalog/Detail/254264?keyword=45387 https://www.markspp.com/Catalog/Detail/254266?keyword=45388 https://www.markspp.com/Catalog/Detail/254268?keyword=45389