Polyaire Collars – Castellated by Polyaire $24.10 150 - $24.10 200 - $24.51 250 - $25.13 300 - $29.87 350 - $31.10 400 - $32.14 450 - $37.49 500 - $37.90 550 - $38.32 600 - $39.35 150 200 250 300 350 400 450 500 550 600 Size 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Fully insulated galvanised steel. Allows for connection of round flexible duct to square sheet metal or Polypanel duct.
