Dual unpressurized cartridge seal intended to provide an excellent sealing performance.

The P888 series is a dual unpressurized cartridge seal intended to provide an excellent sealing performance for pumps. As one of the members of RST Mechanical Seals, P888 is designed to operate in a wide range of process fluids. P888 particularly exhibits high performance in the operation of critical process fluids of lubrication fluids, aqueous solutions, chemicals, light hydrocarbons and water services. The improvements in design reliability and robustness are made possible by the utilisation of sophisticated Finite Element Analysis (FEA) Engineering Software. These features are further verified by the usage of ProEight’s high-end testing equipment, the patented mechanical seal static tester – AccuTEST and mechanical seal dynamic tester – AccuDYN (Patent Pending).

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  • High flow pattern and distributed flush system
  • Uniform-load Multispring compression unit
  • RST Optimized Seal Face Design
  • Emission Restrictive Throttle Bushing
  • Low-temperature including face (ARCAF)®
    (Subject to design requirements & compatibility)
  • Bolted Auxiliary Gland.


  • Centrifugal Heavy Duty Pumps
  • Centrifugal API Process Pumps
  • Centrifugal General Purpose Pumps
  • Positive Displacement Pumps


Temperature - 40 C to 260 C / - 40 F to + 500 F
Pressure Up to 95 bar g /1368 psig
Speeds Up to 25 m/s / 5000 fpm


  • Oil & Gas Production
  • Petroleum Refining
  • Pipeline
  • Pulp & Paper