The aviation industry in Japan has reached the age of high-speed mass transit. To cope with revolutionary technological innovation of the aircraft, the expanded maintenance of airport as well as further improvement of safety, swiftness and economy of refueling line have been requested. In response to such requests in the aviation industry, we have developed and manufactured "hydrant pit" which responds to changes in ground of the refueling pipeline, "surge absorber" for cushioning the shock wave, and "swing joint" which is a flexible rotary joint. They are well received in the market.