Turn the aerator housing counterclockwise and remove it from the faucet. Pull the O-ring off the tip of the faucet spout with your finger. The O-ring prevents leaking between the housing and the faucet. Set the O-ring in a safe place until you are ready to reinstall the housing.
After that, they are referred to as yearlings or stirks if between one and two years of age. A castrated male is called a steer in the United States; older steers are often called bullocks in other parts of the world but in North America this term refers to a young bull.
A mature bull can weigh anywhere from under 2000 lbs to over 3300 lbs. The current average is around 2700 lbs. But, it all depends on each individual bull, and his breeding. Mature bulls can weigh up to 2000-2800 lbs for the more average type breeds including Angus, Holstein, Brahman, Galloways, Charolais, and many others.