FRP Cowl A cowl is a hood-shaped covering of a chimney stack or ventilation discharge. These are used at the end of ducting systems when air is discharged to the outside. The 'U' bend holds water and does not allow foul gasses from your drain to pass back into your kitchen. It also allows any solids dropped down the pipe to sit in the 'U' and be easily removed U Bend FRP, Air Vent FRP
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