- Buna-N FDA Grade
- O-Ring For UV20 or UVB systems manufactured May 2009 or later
*Note: This O-ring is compatible only with PURA systems manufactured in May 2009 or later. The date code is located on the back of the control module. Control modules are replaced every 3 to 5 years, so it is recommended that you consult the owner's manual that was included with your system to ensure you order the correct O-ring. If your system was manufactured before May 2009 you should order part number 151120.