coolant return line

coolant-return line

diverter valve return line

vibration cooling valve return line

automatic non-return valve

auxiliary system return line

bilge suction non-return valve

brake cooling return line

control rod drive return line

coolant return

coolant-return

diverter valve oil return line

double non-return valve

double return valve

double-return valve

downhole non-return valve

excess-oil return line

forward drive return line

fuel return line