For this PTMT Angle Cock faucet to be lead free and rust proof, high quality lightweight PolytetraMethylene Terephthalate (PTMT) was used in its construction. This faucet is appropriate for use in bathrooms, kitchens, gardens, and other parts of the house. Extremely hot and cold water temperatures may be handled with this PTMT Angle Cock. PTMT is a material that can be used in bathrooms and kitchens because it is not reactive to water.