supply of set of purg-o-mat automaticset of purg-o-mat automatic,set of purg-o-mat automatic float air vent valve for roof water tank and vaccum valve :-(1) purg-o-mat automatic float air vent valve with shut-off valve having thread bsp 3/8 to rcfs drg.no.lw 63150, item no.-4, alt.no. -b, qty/kit-01 no. (2) vaccum valve g - 1/2 to rcfs drg.no.lw 63150, item no.-3, alt. no.-b. qty/kit-2 nos. (warranty perio d: up to 30 months from the date of supply) [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitt ed: max 8 lacs ] ]