Water heater elements pressure diaphragm alternative elements Reliable sealing and anti-aging. Good helper for water heater, fuel valve and assorted maintenance. Made of fine materials, it may be used for an extended time. Replacing the previous one is a good choice. Type: Gas water heater equipment colour:black Material:glue size:50mm Package Contents: 20 * Water-gas linkage valve Only the above kit content, diverse merchandise will not be included. Note: Light capturing and diverse reveals may cause the colour of the thing within the photograph barely different from the real thing. The size allowed error is +/- 1-3cm.