These female thread (NPSM) to barb adapters are primary used as adapters to fit on the outlet of pumps. The female 3/4-14 thread fits on the male threaded outlet of pumps from all major marine pump manufacturers. The adapter allows connection of 3/4 ID to the threaded outlet of the pump. The adapters can be used for other applications requiring conversion from 3/4-14 NPSM to 3/4 barb. FA-3/4: Straight Female Adapter - 3/4 Barb x Female 3/4-14 Thread FA-90: 90 Degree Elbow Female Adapter - 3/4 Barb x Female 3/4-14 Thread