extension of pipe line at 16th ward chellaiah nadar south street and 11th ward bharathiyar street in keelapavoor town panchayat ; 1 earth work excavation with an initial lead and lift in hard stiff clay, black cotton, hard red earth, sub murram gravel, stone and earth mixed boulders as per ss20b for pipe laying work. 2 supply and delivery of gi and pvc pipes and specials etc., complete. 3 90mm 4ksc pvc pipe 4 80m gm gate valve 5 80mm x niple 6 80mm flange set 7 80mm gi elbow 8 80mm pipe niple 9 90mm pvc fta 10 90mm pvc elbow 11 80mm gi tee 12 90mm pvc end cab 13 lowering pvc / dwsc rigid pipes and specials to trench and laying to proper grade and alignment, jointing with pvc couplers with cement paste. 14 90mm to 110mm dia ( od ) pvc pipe 15 refilling with trench including all cost of materials and all labour charges etc., complete.