A straight valve with a nipple connector on one end and a quick-connect fitting on the other is a through-type valve specifically designed for pipelines with different connection types. One end features a "nipple" interface (compatible with flexible hoses), while the other end has a quick-connect coupling (for joining rigid pipes or pre-fitted female quick-connect lines). Its core function is to enable rapid connection between hoses and quick-connect pipelines, while simultaneously controlling fluid flow—on/off operation and flow regulation—offering easy assembly and flexible adaptation in low-pressure applications.