supply of set of purge-o-mat automatic float air vent valve and vacuum valve , set of purge-o-mat automatic float air vent valve and vacuum valve for roof w ater tank 30l mounting for lhb coaches. 1) purg-o-mat automatic float air vent valve with s hut-off valve having thread bsp 3/8 inch to rcf drg. no. lw63150, item-4, alt-e, qty/set: 1no. 2 vacuum valve g-1/2 inch to rcf drg. no. lw63150, item-3, alt.e, qty/set: 2 nos. note: (1) as per d rawing air vent valve and shut-off-valve must be procured from m/s hans h. voss tulpenwe g or m/s calefi or m/s watts industries italy. (2) one advance sample to be got approved by t he consignee for functional requirements before bulk supply [ warranty period: 30 months af ter the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]