LabStrong Replacement for Barnstead GSX27


The LabStrong GSX27LS Cartridge O-Ring is comparable to the Thermo Scientific™ Barnstead™ GSX27. The economical and reliable o-ring is designed for use in the Thermo Scientific Barnstead B-Pure™, E-Pure™ and NANOpure™ Quad Style water purification systems. The inexpensive o-ring provides outstanding quality at a significantly lower cost than the competitor’s.

The LabStrong Cartridge O-Ring is designed to seal the space between the cartridge and the head piece of the water purification system. The o-ring is designed to prevent leakage between these two connections. Overtime, all cartridge o-rings wear and eventually fail. 

When the cartridge o-rings fail the water purity will decrease due to water bypassing the cartridge. To prevent this from occurring, LabStrong recommends changing the cartridge o-rings when the cartridges in these water purification systems are replaced. 

Product Specifications:

  • Part Number: GSX27LS
  • Comparable Thermo Scientific Barnstead Part Number: GSX27
  • Product Type: Cartridge O-Ring for Water Purification Systems
  • Compatible With: Thermo Scientific Barnstead B-Pure, E-Pure, and NANOpure Quad Style Water Purification Systems
  • Material: EPDM (Ethylene Propylene)
  • Inside Dimensions: 0.8 inches
  • Color: Black
  • Temperature Range: -65 to 212 degrees Fahrenheit
  • Characteristics: The LabStrong Cartridge O-Ring seals the space between the cartridge and the head piece of the water purification system.


- Made in USA with Global Materials  


*Barnstead, B-Pure, E-Pure, Thermo Scientific and NANOpure are trademarks of Thermo Fisher Scientific. LabStrong Corporation’s replacement cartridge o-ring is not affiliated with, nor supplied or manufactured by Thermo Fisher Scientific.


How to Install LabStrong Cartridges, O-Rings and a Final Filter in a Thermo Scientific Barnstead E-Pure Water Purification System
How to Install LabStrong Cartridges and O-Rings in a Thermo Scientific Barnstead B-Pure Water Purification System