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.
Bullous pemphigoid is an autoimmune disorder (i.e., a condition in which your immune system mistakenly attacks normal parts of the body, resulting in tissue injury or disease). It equally affects men and women and typically affects adults older than 60 years. It may occur in children.