This tube connector is for the ST50, ST60, i60, i70 and ST290 wind vane made by Autohelm / Raymarine. It is shown in the attached parts diagram as the 'Tube Connector'. Note: this part does not include the o-ring - you should retain the o-ring from your existing tube connector for use in this replacement part.
This 3D printed replacement is printed in polycarbonate plastic. It has been modified from the original part to be thicker throughout the threaded/knurled section by .2" diameter to increase its strength. This does not affect its function, but makes it much stronger.