3 Bar diaphragm safety valve with rear attack, 1/2" MF threadThe diaphragm safety valves are used for pressure control on heat generators in heating systems and more generally on all powered systems with water or with mixtures of water and carrier liquids (e.g. glycol). When the calibration pressure is reached, the valve opens preventing, by discharge into the atmosphere, the circuit from reaching pressure spikes that could damage generator or circuit components. The pressure of the exhaust valve is calibrated by the manufacturer, and no variation from the set calibration is possible if it is not altered the valve itself. Disc opening height: micro safety valve -openingStructural shape: spring typeType (channel position): two-wayFlow direction: one-wayDriving mode: manual Note: The data is all measured manually, please allow 1-3cm error, due to the difference of light and display, there will be a certain color difference, the actual object received shall prevail. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!