supply of overhauling kit for trident make auto drain valve to trident part no. as661 consists of 11 items ( 16 nos. ) per set. to be procured from past proven sources of indian railway only. 1. spring compression adv trident part no: ad1051 - 01 no. 2. piston poppet adv trident part no: ad707 - 02 nos 3. handle poppet adv trident part no: ad722 - 01 no 4. closing poppet adv trident part no: ad723 - 01 no 5. o ring ( 10x1.2 ) trident part no: cc287 - 01 no. 6. o ring ( 28.17x3.53 ) trident part no: co002 - 01 no. 7. o ring ( 59.99x2.62 ) trident part no: co056 - 01 no. 8. o ring ( 6.07x1.78 ) trident part no: co057 - 03 nos. 9. o ring ( 31.42x2.62 ) trident partno: co058 -02 nos 10. o ring ( 25.12x1.78 ) trident part no: co059 - 02 nos. 11. seal ring- 3ro trident part no:co060 -01no . note: test certificate and warranty certificate are to be provided by the supplier. [ warranty period: 30 months after the date of delivery ]