supply of overhauling kit for cock dh7overhauling kit for cock dh7, overhauling kit for cock dh7 to kbi part no. i88738 for air brake system of lhb coaches.consisting of 06 items. s.no., description, kbi part no., qty / set. ( 1 ) retaini ng ring, part no . 457709, qty / set =1 no. ( 2 ) knorrk-ring, part no. 462575, qty / set =2 nos. ( 3 ) o ring , part no. a47412, qty / set =1 no. ( 4 ) o-ring, part no .a95468, qty / set =1no. ( 5 ) o rin g, part no. k4140, qty / set =3 nos. ( 6 ) valve seat bushing, part no.c170298, qty / set =1 no [ warranty period: 30 months after the date of delivery ]