The Japanese 30 ํ Flare male connector will mate with a Japanese 30 ํ flare female only.
The male and female have straight threads and a 30 ํ seat. The seal is made on the 30 ํ seat.
The threads on the Japanese 30 ํ flare connector confrom to JIS B0202, which are the same as the BSPOR threads. The the british and Japanese connectors have a 30 ํ seat, but they are not interchangable because the British seat is inverted.