Best Seller | ZURN RK4-350CK2 Check Assembly #2,Repair Kit, 2 1/2"-4 Backflow Preventer Repair Kit, For Use With Model 350, 4 In., Model 350ADA, 2-1/2 In., 3 In. and 4 In., Model 375, 4 In., Model 375A, 2-1/2 In., 3 In. and 4 In., Model 450, 4 In., Model 475, 4 In., Includes #2 Check Assembly, Lubricant, Retainers ... more ZURN RK4-350CK2 Check Assembly #2,Repair Kit, 2 1/2"-4 Backflow Preventer Repair Kit, For Use With Model 350, 4 In., Model 350ADA, 2-1/2 In., 3 In. and 4 In., Model 375, 4 In., Model 375A, 2-1/2 In., 3 In. and 4 In., Model 450, 4 In., Model 475, 4 In., Includes #2 Check Assembly, Lubricant, Retainers | | $417.99 go to store |