Glow-worm gaskets, flue elbow microns, O-rings, seals, and washers are being used to provide a seal to prevent the loss of air, gas, and water in most boilers. Thus, many of the O-rings, gaskets, seals, and washers are specific to a certain specific location within the boiler and are extremely seldom interchangeable due to their size and thickness. They allow the system to be sealed to reduce the opportunity of leakage.