Package Include 12 x Check Valves Characteristics - Size: 4.50X2.00X2.00cm/ 1.77X0.79X0.79inch. - These one- way check valves are made of plastic material, safe and anti- rust. - Color: As shown. - The check valves is widely used in many industry applications including fuel pumps, household appliances, agricultural equipment, etc. - The check valves are easy to install, convenient for you to unscrew and replace. - Material: Plastic. - These inline check valves allow the liquid or air to stream in , thus preventing backward stream. - Features good and . Goods Description The check valves are easy to install, convenient for you to unscrew and replace. The check valves are widely used in many industry applications including fuel pumps, household appliances, agricultural equipment, etc.