[Size] Thread size of NPT: 1/8-27 NPT; OD of barb: 1/4 inch. [Material] Made of aluminum alloy 6061-T2, anodized black surface. [Parameter] Working temperature range:-65°F to 252°F (-53°C to 122°C) [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.