Overhauling kit for KBI make check valve to KBI Part No. I. 3. 1902 consisting of 4 items. 1 ) Sealing Ring KBI Part No. 453890, Qty/ kit- 02 Nos. 2 ) O Ring KBI Part No. A27763/ 26, Qty/ kit- 02 Nos. 3 ) Toothed washer KBI Part No. 466031, Qty/ kit- 02 Nos. 4 ) Valve Head KBI Part No. A48128, Qty/ kit- 02 Nos.