[Size] Thread size of NPT: 1/8-27 NPT; OD of barb: 1/4 inch. [Material] Made of aluminum alloy 6061-T4, anodized black surface. [Parameter] Working pressure: 4000 PSI. Burst pressure: 10000 PSI. Working temperature range: -76°F to 572°F. [Seal] The NPT side is sealed with tapered threads,please use sealant or PTFE tape to ensure a better seal. [Installation] When installing barb fittings, it is recommended to use clamps to ensure sealing.