Check the listing for details. 25Pcs Brass Compression Insert Compression Insert Tube Support for 1/2" OD Tube. Condition: New. Listed at 18.21 USD. Brass compression inserts are suitable for compression connections for plastic, nylon hoses, etc. They are widely used in hydraulic and pneumatic systems, HVAC, humidifiers, etc.SpecificationColor: Gold ToneMaterial: BrassSuitable for Tube OD: 12 mm/1/2 Inch Height: 17 mm/0.67 InchSize: 9.5 x 12 mm/0.37 x 0.47 Inch(OD*Base Dia)Package List: 25 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.