The Vickers machine gun was a British machine gun. It was water cooled. It held one gallon of water, to keep the loss of water to a minimum, a rubber hose was attached to a container that condensed steam. The Vickers machine gun used .303 bullets same as the Lee-Enfield rifle, with a fire rate of 450 bullets per minute. But it had a high rate of a wastage of bullets.
The machine gun weighed about 20 kg and had to be used with a tripod. Therefore, it was not the easiest weapon to move around the battlefield. The machine gun could be used by six men, but in a defensive position could cause some serious casualties.
The Vickers gun was replaced by the Lewis Gun because of its flaws, but it was used throughout the war.