PVC pipes and fittings are manufactured using a diverse range of stabilizers, while UPVC is produced using tin stabilizers. PVC fittings commonly come in white or gray colors, but green, blue, and yellow options are also available. The colors do not hold specific meanings, though white and gray are frequently utilized in plumbing applications, and green is commonly associated with sewage. The advantages of PVC fittings include their lightweight nature for easy transportation, flameproof properties, electrical insulation, resistance to shocks caused by earthquakes and external pressures, as well as resistance to corrosive substances and solvents, among others.