Water cap

This is a prototype threaded cap to seal off the excess water output of a diesel water pump.
The thread is 1.66mm pitch (~15TPI) , about 1" OD. This is close to 3/4BSP but slightly smaller and finer pitch.
It was designed in South Sudan by Ben Savonen for Field Ready, as part of a project with Water for South Sudan. only one part has been printed and no usage feedback has been received, so its unclear how effective this design is at this moment.