Pvc water supply pipe installation should be to big head or small head

To the small head. From the gasket big to small direction. To the water pump installation pump outlet pipe, must be installed in the pump outlet size head. Pipe installation direction should be from the direction of the gasket large to small, the installation of the large head in the front, the small head in the back, along the direction of water flow. Reducer is also known as size head, reducer, reducer straight. One of the chemical fittings, used for the connection between two different pipe diameters. According to the different shapes, it is divided into concentric size head and eccentric size head.