Home / Flap Valves / HDPE Flap Valves HDPE Flap Valves Size: DN150 DN200 DN250 DN300 DN400 DN500 Add to your Wish List Request a Quote Request a Quote Close Your Name: Contact Email Address: Telephone: Message:  Please enable JavaScript in your browser to send us a message. We are a specialist supplier of standard and bespoke flow control products Rush delivery upon request Secure online payment soon available Description HDPE flap valve suitable for gravitational outflow. Max 5 mwc pressure. Installation type is wall mounting.