Short ventilation reducer with female connection 

This Pressed Female Reducers is perfect for heat recovery systems and ventilation system. Standard nominal diameters up to DN 315 mm are available for pressed pieces at a lower price and with an improved finish. 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. The same kind of company in the sale also Pressed Male Reducers.