This is a threaded adapter to connector between two pipe threads. There is no sealing mechanism, so it with either need PTFE tape, liquid thread sealant (adhesive) or a rubber gasket. The 1/2" BSP thread is the same as is commonly used on shower heads, so this is useful for adapting those hoses for other uses.
3_4_to_1_2_BSP_adapter.SLDPRT | 591.2KB | |
3_4_to_1_2_BSP_adapter_v1.STL | 1.3MB |