Check the listing for details. 20Pack 12mm ODx9mm ID Tube Brass Compression Insert. Condition: New. Listed at 12.51 USD. Brass compression inserts are suitable for compression connections for plastic hoses, nylon hoses, etc. They are widely used in hydraulic and pneumatic systems, HVAC, humidifiers, and so on.SpecificationColor: Gold ToneMaterial: BrassSuitable for 12 mm/0.47" OD x 9 mm/0.35" ID TubeHeight: 14.5 mm/0.57 InchSize:9 x 12 mm/0.35 x 0.47 Inch(OD*Base Dia)Package List: 20 Pcs x Brass Compression InsertAdvantageThe brass compression insert is made of durable and reusable brass material which is strong and not easy to wear, has corrosion resistance, and high-pressure resistance, and can be used for a long time. It is suitable for different types of environments.The surface is smooth and burr-free, the bite is tight, and it is not easy to get stuck or leak oil, providing a secure connection for hose connections.