Shop › 5kw - 75mm - Duct Joiner - To Extend Ducting Image 1 of 3 Image 2 of 3 Image 3 of 3 5kw - 75mm - Duct Joiner - To Extend Ducting $12.00 Joiner for a 5kw diesel heater - 75mm diameter. Used to extend 5kw Ducting. Add To Cart Added! Joiner for a 5kw diesel heater - 75mm diameter. Used to extend 5kw Ducting. Reviews Reviewer Name Review Date Star Rating Description Posted on Etsy Product Show More You Might Also Like Mounting Plate + Metal Flange ( Ring ) $25.00 Au Focus Tank Mounting Bracket $84.95 Exhaust system kit $84.95 Born To Roam Combo! Heavy Duty Mounting Plate & Hole Saw (115mm) $64.95 Pump Mount $13.00