Section 5 - HVAC Hydronics & Backflow GRUNDFOS CIRCULATOR PUMP CONNECTIONS Grundfos 1/2 " Sweat Half Union Flange Grundfos GU 125 Union 1/2 " Union Flange. Cat. # 1/2 " Sets 29102 45366 OEM # 529913 519850 Material Bronze Bronze Connection Type GU 125 Union GU 125 Union Grundfos 3/4 " Sweat Half Union Flanges (Pair) Grundfos 3/4 " Sweat Flange Half Union. Cat. # 3/4 " Sets 29103 45369 45370 45371 OEM # 529911 529912 519852 519851 Material Bronze Bronze Bronze Bronze Connection Type GU 125 Union GU 125 Union GU 125 Union GU 125 Union Grundfos 3/4 " & 1 " Threaded Flanges (Pair) Grundfos 3/4 " and 1 " Threaded Flange (Pair). Cat. # 3/4 " Sets 29104 29100 1 " Sets 29105 29101 OEM # 519651 519601 519652 519602 Material Bronze Cast Iron Bronze Cast Iron Connection Type Flanged Flanged Flanged Flanged Grundfos 1-1/4 " Threaded Flange (Pair) Grundfos 1-1/4 " Flange (Pair). Cat. # 1-1/4 " Sets 45376 45377 OEM # Material 96409356 519603 Bronze Cast Iron Connection Type Flanged Flanged Grundfos 1-1/2 " Threaded Flange (Pair) Grundfos 1-1/4 " Flange (Pair). Cat. # 1-1/2 " Sets 45380 42299 45381 OEM # Material 539615 519604 539605 Bronze Cast Iron Cast Iron Connection Type Flanged Flanged Flanged 5-66F PHONE 800-772-2347 FAX 800-991-6275https://www.markspp.com/Catalog/Detail/27138?keyword=29102 https://www.markspp.com/Catalog/Detail/254187?keyword=45366 https://www.markspp.com/Catalog/Detail/27139?keyword=29103 https://www.markspp.com/Catalog/Detail/254193?keyword=45369 https://www.markspp.com/Catalog/Detail/254194?keyword=45370 https://www.markspp.com/Catalog/Detail/254195?keyword=45371 https://www.markspp.com/Catalog/Detail/27140?keyword=29104 https://www.markspp.com/Catalog/Detail/27136 https://www.markspp.com/Catalog/Detail/27141?keyword=29105 https://www.markspp.com/Catalog/Detail/27137?keyword=29101 https://www.markspp.com/Catalog/Detail/254226?keyword=45376 https://www.markspp.com/Catalog/Detail/254228?keyword=45377 https://www.markspp.com/Catalog/Detail/254234?keyword=45380 https://www.markspp.com/Catalog/Detail/219967?keyword=42299 https://www.markspp.com/Catalog/Detail/254240?keyword=45381