Description Literature Description Freudenberg Sealing Technologies (formerly Tobul) gas valve guard for TBR30-.2NMD Series Bladder accumulators, 1 Quart, phosphate coated, protects the valve during handling, transportation, storage and use. The gas valve guard does need to be removed to provide access to the valve. State of California Proposition 65 WARNINGCancer and Reproductive Harm - www.P65Warnings.ca.gov. Literature & Docs Accessories