Question

an opd serves as a choose the correct answer to fill in the blank. method for keeping moisture and air out of the cylinder secondary means of preventing overfilling of cylinders way to release excess pressure in the event a cylinder is overpressurized

Explanation:

OPD stands for Over - Pressure Device. Its main function is to release excess pressure when a cylinder is over - pressurized to prevent dangerous situations.

Answer:

way to release excess pressure in the event a cylinder is overpressurized