supply of set of item no. 1&2 for modification worksset of item no. 1&2 for modification works,set of item no. 1&2 for modification works as per rdso specn.no.rdso/pe/ms/ac/0089-200 2 rev.0 and hq lr.no.el/268/24/modification /2059 dated 28.10.2024. item no.1 : differential pressure swi tches (dps) of pressure range from 0.08 -1.20 (inches wc) shall be provided with more than 10,00,000 ope rations with automatic reset with ip-54 protection as per iec-60529 with ul-94 v0 -qty 01 no. per set. item no.2: suitable length ss 304 tube with id 4.0mm and 6.6 of od and length : 1.173 mtrs to connect the diff erential pressure switch to heating element -qty 01 no.per set. make brand: beck or similar. [ warrant y period: 30 months after the date of delivery ] ]