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fresh and superb Features: Reliable sealed and anti-aging. Good helper on your repairment of water heater, gas valve and etc. Made of high-quality materials, thus it may be used for a protracted time. It&;s a good selection to exchange your old one. Pressure Diaphragm ONLY,other equipment demo within the photograph isn't always included. Specification: Material: Plastic Color: Black Diameter: app/2 Quantity: 20 Pcs Note: No retail equipment Transition: 1cm=10mm=0 Please enable 0-1cm error because of manual measurement. pls ensure you do not intellect earlier than you bid. Due to the variation between various monitors, the image might not reflect the actual colour of the item. Thank you! Package includes: 20 Pcs x Pressure Diaphragm