Features: Brand new and high quality Ensure the safety of your swimming pool cleaner with this pressure relief valves for 180 280. Designed to monitor and control the working pressure, it protects your equipment from damage. Made from PC materials, this safety valves is corrosion resistant and can withstand high temperatures, ensuring long term stability and reliable performances This safety valves make sure that your cleaner operates within a safe pressure range. The valves relieves excess pressure to speed up, so the pool cleaner performs quickly and properly. Specifications: Material:PC Top width: 3cm/1.18inches Bottom width: 4.6cm/1.81inches Height: 4.5cm/1.77inches Package Includes: 2Pcs Pressure Relief Valves note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.