90 degree right angle adapter - 3/8" BSP brass adapter.
Left hand thread form.
Although this fitting is intended for fuel gas we buy them having been cleaned to oxygen safe standard. This adapter comes with a left hand G3/8" BSP male thread to a loose left hand G3/8" BSP female nut.
The third image shows the loose nut having been pulled back to reveal the bullnose of the connection so you can see it is a true gas fitting connection rather than something else. No PTFE is required as they should be brass on brass sealing.