The Aqualine GCPL-400 is a 4" Galvanized Coupling. Since 2005, Aqualine has quickly become a recognized supplier of quality irrigation and plumbing products to distributors throughout North America. Developing strong relationships with customers and understanding their product demands is priority to the Aqualine team. Aqualine strives to be viewed as distributors’ most reliable and easiest choice when it comes to finding the plumbing and irrigation products they need.