supply of piston assembly for bolster friction devicepiston assembly for bolster friction device,piston assembly for bolster friction device for wap4 loco, consisting of (1) piston as per r dso drg no 29.04.06 alt-6 or latest item reference 1 / a1, as per modification sheet no mp.mod.vl.04-11 -09 (rev.0) dated 28.04.2009, and (2) pin, (3) sleeve 14.8x19x38 mm (4) end plate, (5) dowel pin 6x61 mm and (6) screw hex. head m8x10 mm. item (2) to (6) shall be as per s.rly els/ed drg no sr.dee/rs/ ed/mech-96, alt-1 [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitte d: max 8 lacs ] ]