... people manual operation). 2. Connection type: flanged type, push-on type, mechanical joint type, plain ends type 3. Material: namematerialbodyHT200 QT450--10diskQ235-A- ... more than 8 m , please indicate the water head when exceed 3. When installation, it is better use flange connection, ... no human operation, usable flange connection, also can connect with embedded parts fixed Flap valve socket type