It occurred in 4 and 5 days when air leakage occurred from the coupler, the cause was scratches and wear of protrusions fixing the male coupler located 8 mm from the tip. 〇 In the maker goods such as TOKOKI machines, I have been using it for about 30 years so far, but I have never had such a trouble. I have at least two or three years. It is a state of loss of cheap money buying as much as 100 yen. Is it soft material, because it is a thing to disassemble quickly, so I bought a few more strengths, so I can not disappoint you. If you are okay with cash on delivery shipping charges in kind.