Features 1、The cylinder sleeve is suitable for pump head of 550W silent oil‑free air compressor. 2、Standard in size, inner diameter is 63.7mm, outer diameter is 69mm, height is 24.5mm. 3、Made of cast iron, heat‑resistant and corrosion‑resistant, no need for frequent replacement. 4、The cylinder sleeve is manufactured according to the standard, with strong adaptability, easy to disassemble and install. 5、The exterior of the cylinder sleeve is glossy and shiny, and the accessories will not be damaged during installation and use. Specification Item Type: Cylinder Sleeve Model: Oil-free 550W cylinder sleeve Outer Diameter: Approx. 69mm / 2.7in Inner Diameter: Approx. 63.7mm / 2.5in Height: Approx. 24.5mm / 1in Material: Cast iron Drive Mode: Pneumatic Purpose: Air compressor oil-free 550W cylinder sleeve Package List 1 x Cylinder Sleeve