supply of 1. set of condition based item for trident make air drier model ld 2000122. 2. purge valve left assembly, trident part no. ad930. 3. double poppet valve, trident part no ad939. 4. shuttle valve assembly, trident part no. ad958.1. set of condition based item for trident make air drier model ld 2000122. 2. purge valve left assembly, trident part no. ad930. 3. double poppet valve, trident part no ad939. 4. shuttle valve assembly, trident part no. ad958.,set of condition based item for trident make air drier model ld 2000122 fit ted in wap-4 conventional electric locomotives. one set consists of items 1) purge valve right assembly, trident part no. adm912, qty/set 01 no. [ warranty period: 30 months a fter the date of delivery ] , purge valve left assembly, trident part no. ad930. [ warranty period: 30 months after the date o f delivery ] , double poppet valve, trident part no ad939. [ warranty period: 30 months after the date of deliv ery ] , shuttle valve assembly, trident part no. ad958. [ warranty period: 30 months after the date of d elivery ]