1PC 1/8" 1/4" 3/8" 1/2" 3/4"BSP Hexagonal Female Thread Brass Pipe Cap Hex Head End Cap Plug Fitting Coupler Connector Adapter
https://www.vogueparade.com/shopping/EN/200282142/1/4000186323386/1pc-18-14-38-12-34bsp-hexagonal-female-thread-brass-pipe-cap-hex-head-end-cap-plug-fitting-coupler-connector-adapter//