supply of supply of epdm rubber gasket , supply of epdm rubber gasket thickness 3mm thick suitable for supply, return and fresh air ducts of lhb ac coaches as per rdso spec. no. rdso/pe/spec/0197-2020 (rev.-0) and confirming to rds o drawing no. rdso/pe/sk/ac/0069-2004(rev-3). (1) epdm rubber gasket 3 mm thick suitable for both sup ply air duct = 4 nos (2 front side + 2 back side) (2) epdm rubber gasket 3 mm thick suitable for four nos ret urn air duct = 8 nos (4 front side + 4 back side) (3) epdm rubber gasket 3 mm thick suitable for four nos fr sh air duct = 8 nos (4 front side + 4 back side) one set consist 20 nos gasket (including front and back side of ducts) for one lhb ac coach. accepted make/brand: - as per rdso vendor directory item id: 310 0018. [ warranty period: 30 months after the date of delivery ] ]