Description Literature Description Freudenberg Sealing Technologies (formerly Tobul) oil port lock ring used with TBR30, TBRT30, TBR50 and TBRT50 Bladder accumulator Series, phosphate coated is a fastener that holds assemblies onto a shaft creating a shoulder that keeps parts in proper place. State of California Proposition 65 WARNINGCancer and Reproductive Harm - www.P65Warnings.ca.gov. Literature & Docs Accessories