Description Accessories Description Freudenberg Sealing Technologies (formerly Tobul) O ring seal (EPR) used with piston accumulator series 3AT30, 3.2AT50 and 4AT100 is a mechanical gasket with a round cross-section. They are made from elastomer materials and used in various fluid applications to form a leak-proof seal between two parts. O-rings are installed into a machined or molded grove on a part surface; when the two parts are joined, it compresses the o-ring and deforms the cross-section, creating a tight seal. State of California Proposition 65 WARNINGCancer and Reproductive Harm - www.P65Warnings.ca.gov. Literature & Docs Accessories Freudenberg NOK Sealing Technologies 030AT30-2NA19 Piston Accumulator, 3000 PSI, 2 Pt, 3"OD Was: Now: $1,061.24 Add To Cart The item has been added Freudenberg NOK Sealing Technologies 030AT30-.5NA19 Piston Accumulator, 3000 PSI, 0.5 Pt, 3"OD Was: Now: $1,018.70 Add To Cart The item has been added Freudenberg NOK Sealing Technologies 030AT30-1NA19 Piston Accumulator, 3000 PSI, 1 Pt, 3"OD Was: Now: $1,031.72 Add To Cart The item has been added