supply of 1.single ferrule progressive ring of size 28 mm 2.progressive ring 22 mm part no. dpr22lx3.wsv28lomda3c-bulk head elbow 28mm , single ferrule progressive ring of size 28 mm od as per ermeto part no: dpr28l71x or equivalent, [ warranty period: 30 mont hs after the date of delivery ] ] , progressive ring 22 mm part no. dpr22lx m/s parker or part no. 0010302000 of m/s voss or part no. stpdr22l or m/s volz or part no. pr-m22l of m/s eaton walterscheid or part no. zdl22 of m/s blanke armaturn gmbh. [ warranty period: 30 months after the date of deliver y ] ] , wsv28lomda3c-bulk head elbow 28mm complete assembly of body nut, checknut & ferrule. as per spec mdst108 or latest. [ war ranty period: 30 months after the date of delivery ] ]