The LabStrong D0815LS cartridge is comparable to the Thermo Scientific Barnstead D0815 cartridge. Side-by-side testing shows fantastic results for purity and longevity. The LabStrong water purification cartridge is used with the Thermo Scientific Barnstead B-Pure and Bantam water purification systems. The LabStrong cartridge is also used in cooling loops. The water purification cartridge provides outstanding quality you expect from your water system at a low cost. The cartridge is an economical alternative for all laboratories. LabStrong takes extra care in sealing our water purification cartridges to ensure exceptional quality is maintained throughout the two year shelf life. This cartridge is sealed in a military specification vapor barrier foil Mylar bag, which dramatically inhibits drying out of the resin. The LabStrong GSX28LS O-Ring Canister Gasket, which is comparable to the Thermo Scientific Barnstead GSX28 O-Ring, is sold separately.