Non Return Valve 125mm / 5" Ducting Pipe Connector Back Draught Shutter Damper

Ducting Pipe Connector 125mm/5". Connector fits into Ø125mm (5") round pipe ducting to connect two lengths together in a straight line. For use with the Ø125mm (5") Round Pipe Ducting systems. Connector type: Round male fittings - outer Ø125mm (5") to fit inner Ø125mm (5") of the ducting pipe.

eBay