2 1/2" to 4" Dia Backflow Repair Repair Kit, #1 Check Assy for 350/450, Zurn, Mfr#: RK4-350CK1

The 350CK1 Repair Kit is compatible 2 1/2", 3", and 4" sizes. The repair kit comes with Seat Retainer #1, O-ring Check, Bolt Poppet Retainer, Handle #1 Poppet Assembly, Washer Poppet Bolt, O-ring Poppet Bolt, Poppet Retainer, Seal Ring, and Seat Assembly #1 Poppet.