rt138DATA & SPECIFICATIONS RT-138 Issue 1, Page 11 13 Cylinder oils of excessively hh BN for the fuel sulphur can lead to excessive piston crown deposit accumulation. Piston crown deposits need to be carefully monitoredRT138 - Running Trap 32mm. 38mm Seal. We manufacture a wide and comprehensive range of waste traps, including anti-syphon units and universal flexible wastes, to fit applications from