Thickening design, suitable for duct connections in piping systems. Made of high-quality material, environmentally friendly, non-toxic, and durable. Easy to install using duct tape or duct clamps to connect air ducts. Ideal for use in bathrooms, kitchens, apartments, homes, offices, and hotel HVAC systems. Perfect for connecting 150mm to 100mm duct systems. Perfect for connecting 200mm to 150mm duct systems. Perfect for connecting 110mm to 100mm duct systems. Color: White Material: Plastic Size: φ150-100mm, upper diameter 97mm, lower diameter 155mm, height 117mm φ200-150mm, upper diameter 147mm, lower diameter 205mm, height 111mm φ110-100mm, upper diameter 98mm, lower diameter 114mm, height 97mm Package Contents: 1 x Pipe Adaptor Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture to vary slightly from the real thing. Measurement may vary by 1-3cm.