Steel Adapter, Female 3/8 in BSP Blanking Cap

A blanking cap threads onto an open female port to seal it off completely, keeping fluid in and contaminants out. This one fits a 3/8-19 female BSPP port, so if you've got an unused port with that thread spec, it'll do the job. The 60 degree seat helps form a solid seal at the connection point. Zinc plated steel construction means it holds up reasonably well in typical hydraulic environments.

This blanking cap is made to fit a 3/8-19 female BSPP (British Standard Parallel Pipe) thread with a 60-degree seat, so as long as your fitting matches that, you should be good to go.