Ducting Extension 125mm x 1m SKU: 161325 MODEL: HSD125/1 Error. try again later You've successfully joined the club $ 8 .66 each Mitre 10 MSAvailable at Mitre 10 MEGA and selected Mitre 10 stores. Variants Standards approved ducting. Most suited for bathroom and laundry applications. Features and benefits 125mm ducting. 1m extension kit.