Reliable sealed and anti-aging. Good helper on your repairment of water heater, fuel valve and etc. Made of high-quality materials, thus it may be used for an extended time. It&;s a good choice to exchange your outdated one. Pressure Diaphragm ONLY,other kit demo within the photo isn't included. Specification: Material: Plastic Color: Black Diameter: app/2 Quantity: 10 Pcs Note: No retail package Transition: 1cm=10mm=0 Please allow 0-1cm error due to handbook measurement. pls make sure you don't intellect earlier than you bid. Due to the adaptation between assorted monitors, the image won't replicate the particular coloration of the item. Thank you! Package includes: 10 Pcs x Pressure Diaphragm