Material: made of nickel plated brass, rust resistant and durable to use Threads: G1/4' BSP; 5mm male thread length - G1/4' BSP, 6mm female thread length Feature: Embedded O ring design for leakproof seal, and the top of extender fitting can turn 360 degrees, which can be in precisely the direction needed. Great seal: Save you from leaks issues. The consistent threads make it bite in great plus the o-ring to ensure there is no leaking in the tubes Application: Adapter allows connection of fitting with G1/4' threads to custom water loop build, suitable for rigid tubing, metal and PETG tube etc.