Special Features :- It is specially designed where uninterruption flow is required. It is made of two parts with 2 nos. 3 way valves or 4 nos. Butterfly valve for maximum utility.Optional feature like pr. drop indicator (audio & visual)can be provided for change over. Complete automation also can be supplied for change over. Connection Size :- 25 NB to 600 NB flanged end. Filtration :- Range – 10 micron to 500 micron.