Originally, gas construction can only be done by qualified personnel, so we can not sell any parts. But if you buy it online, it is surprisingly cheap and construction is quite easy. There is a doubt as to the way the gas affiliate of the company hangs with the qualification (actually a simple course only) and harasses profiteers. (Construction was done in line with friends of qualified people)
Since the bore diameter was 13 mm, it is not suitable for ordinary household use, it is necessary to replace the gas stopper. The connector was sold in general, but it was hard work because it is 9.5 mm inside diameter.