Description Literature Description Freudenberg Sealing Technologies (formerly Tobul) poppet lock nut resists loosening under high vibrations and torque used with TBR30, TBRT30, TBR50 and TBRT50 Bladder accumulator Series. State of California Proposition 65 WARNINGCancer and Reproductive Harm - www.P65Warnings.ca.gov. Literature & Docs Accessories