bids are invited for custom bid for services - boq item no 1 semi skilled ref mechanic per shift of 08 hours 3510 nos , custom bid for services - boq item no 2 semi skilled pipe fitter per shift of 08 hours 300 nos , custom bid for services - boq item no 3 un skilled helper per shift of 08 hours 300 nos , custom bid for services - boq item no 4 supply only 15mm bore steel water tubing medium grade galvanized isi marked 12 nos , custom bid for services - boq item no 5 supply only 20mm bore gun metal globe or gate valves with iron wheel head isi marked 6 each , custom bid for services - boq item no 6 supply only 20mm bore ball valveminimum weight 210grams high pressure of ptmt with epoxy coated aluminium rod 10 each , custom bid for services - boq item no 7 supply of bleaching powder necessary for cleaning of tanks 50 kg