supply of set of purge-o-mat automatic float air vent valve and vacuum valve for roof water tankset of purge-o-mat automatic float air vent valve and vacuum valve for roof water tank,set of purge-o-mat automatic float air vent valve and vacuum valve for roof water tank ( 1) purg-o-mat automatic float air vent valve with shut-off valve having thread bsp 3/8 inch to rcf drg. no. lw63150, item-4, alt-e, qty/set : 1 no. (2) vacuum valve g-1/2 inch to rcf drg. no. lw63150, item-3, alt.e, qty/set : 2 nos. make: m/s hans h.voss tulpenweg or m/s calefi or m/s wattindusteies italy. [ warranty period: 30 months after the date of delivery ] ]