Miniaturised Straight Male Connectors (RL1) - 6mm x 1/8" BSPP. Thread Size: 1/8" BSPP (British Standard Pipe Parallel). Connection: 6mm OD push-in x 1/8" BSPP male thread. Thread Sealing: Use PTFE tape or appropriate thread sealant on the BSPP threads for leak-free connections.
eBay