Description Literature Description Freudenberg Sealing Technologies (formerly Tobul) oil port assembly, 2" NPT, Female, phosphate coated, for TBR30 Bladder accumulator, 2.5 to 15 Gallon, Optional, prevents draining of the bladder into the oil channel and closes when the pressure on the gas side is higher than on the fluid side. State of California Proposition 65 WARNINGCancer and Reproductive Harm - www.P65Warnings.ca.gov. Literature & Docs Accessories