CP fittings refer to Chrome Plated fittings, which are widely used in bathrooms and kitchens for faucets, taps, showers, and other plumbing fixtures. These fittings are made from materials like brass or stainless steel, which are then coated with a layer of chrome plating to provide a shiny, polished finish. CP fittings are popular for their aesthetic appeal, durability, and resistance to corrosion.