Pressed reducer male/female GVH 

Suitable for the size and diameter conversion of Spiral Ducts in ventilation system. The largest end of the Pressed Female Reducers fits over a fitting and the smallest fits into a Spiral Ducts. This allows another large fitting of the same diameter to be installed directly onto the Pressed Female Reducers. Reducing pipe (size head) is a piece of pipe used in reducing pipe diameter. The forming process is usually used for reducing the diameter pressing, expanding pressing or reducing the diameter and expanding pressing, for some specifications of reducing pipe can also use stamping forming.