Overhauling Kit for KBI Make Duplex check valve consisting of 04 items. as per list ( 1 ) Sealing Ring Part No. 453890 Qty. 02 ( 2 ) Ring Part No. A27763/ 26 Qty. 02 ( 3 ) Toothed Washer Part No. 466031 Qty. 01 ( 4 ) Valved Hcad Part No. A48128 Qty. 02.