BSP Female Thread 1/8" 1/4" 3/8" 1/2" Brass Pipe Fitting Adapter DIY Coupler. IP44 3Pin Industrial Plug Socket 16A 32A 240V Waterproof Power Cable Connector. 1Piece Power amplifier board. Compatible with various speakers.It is widely used in refitting loudspeakers, power amplifiers and automotive Bluetooth devices.
eBay