Made from military stainless steel, this Seal CARTRIDGE is more robust and corrosion resistant. Easy to push into side seal without crushing the o-ring. The Side Seal is made of high-strength stainless steel, corrosion-resistant and wear-resistant. Are you worried about the deformation of your Seal CARTRIDGE during the disassembly process? Does your Seal CARTRIDGE leak leaks frequently and cause downtime? Please try this one, it will work longer.