It have a black rubber retaining gasket, which is easy to use and can seal the faucet well, the faucet from leaking This faucet Valves Cores is suitable for bathroom, kitchen, balcony, garden, vegetable field Not easy to wear and tear, even after multiple switches, it still smoothly Thickened thread, hard and strong, stable Make of Brass materials, Strong and thick, stable, universals hot and cold water, Manufacturer: Hsyzygian