Although I was purchasing about 20 pieces in total, the thing which I used first did not have one year and the thing in use after that was also about 10 months and water leak occurred. Everything I bought is about 10 months old and it is water leakage. Likewise, the L-shaped swivel adapter of Shimizu Seisakusho has water leakage! Although it is cheap, there is a problem in durability As a level of expendable items that I want to have for at least a year, it is slow. I am looking for a durable substitute for the necessary parts.