bids are invited for non return valve 4 inch , by pass tee , flange end pp 4 inch , pressure relief valve 2 inch , inlet manifold , pp 4 inch x 600 mm for double or tripple filters , butterfly valve 4 inch , outlet manifold , pp, 4 inch x 385 mm for double or tripple filters , air release valve 1 and half inch , pressure gauge 2 inch, glycerine , ventury injector assembly 2 inch , disc filter 50 m3 per hr x 3 inch , hydro-cyclone filter 50 m3 per hr x 3 inch pp , gi fittings , pvc pipe 110 mm x 4 kg per cm2 , pvc pipe 90 mm x 4 kg per cm2 , pvc pipe 75 mm x 4 kg per cm2 , pvc pipe 50 mm x 6 kg per cm2 , butterfly valve 2.5 inch , flush valve 75 mm , emmitting pipe 20 mm, 2 lph, 60cm , plain laterals 20 mm 2.5kg per cm2 - class i , start connector20 x 20mm , grommet 20 mm , end cap 20 mm , nipple 20 mm , service saddle 75mm , pvc pipe 32mm x 10 kg per cm2 , threaded elbow 32 mm , pp ball valve 32 mm , service saddle 110mm , butterfly valve 3 inch , pump connecting 90 mm , end plug with quick action 90 mm , pvc or hdpe fittings , installation charges