Features: Reliable sealed and anti-aging. Good helper in your repairment of water heater, gasoline and etc. Made of fantastic materials, thus it may be used for an extended time. It's a sensible choice to switch your old one. Pressure Diaphragm ONLY,other equipment in the picture 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 instruction manual measurement. pls make sure you do not mind earlier than you bid. Due to the variation between diversified monitors, the image won't replicate the actual colour of the item. Thank you! Package includes: 10 Pcs Pressure Diaphragm