Gem Pump Silicon Diaphragm creates the suction in the Gem Pump and prevents backflow into the Gem Pump – making it a closed system pump.

• Made from food grade silicon.
• Included: 1 x Silicon diaphragm.
• If your Gem Pump silicon diaphragm is damaged or has a tear or whole, it is
  unable to create the suction in your Gem Pump and will need to be replaced.